diff --git a/taiga/importers/asana/api.py b/taiga/importers/asana/api.py
index 3982a958..611eda8b 100644
--- a/taiga/importers/asana/api.py
+++ b/taiga/importers/asana/api.py
@@ -48,9 +48,9 @@ class AsanaImporterViewSet(viewsets.ViewSet):
         try:
             users = importer.list_users(project_id)
         except exceptions.InvalidRequest:
-            raise exc.BadRequest(_('Invalid asana api request'))
+            raise exc.BadRequest(_('Invalid Asana API request'))
         except exceptions.FailedRequest:
-            raise exc.BadRequest(_('Failed to make the request to asana api'))
+            raise exc.BadRequest(_('Failed to make the request to Asana API'))
 
         for user in users:
             if user['detected_user']:
@@ -71,9 +71,9 @@ class AsanaImporterViewSet(viewsets.ViewSet):
         try:
             projects = importer.list_projects()
         except exceptions.InvalidRequest:
-            raise exc.BadRequest(_('Invalid asana api request'))
+            raise exc.BadRequest(_('Invalid Asana API request'))
         except exceptions.FailedRequest:
-            raise exc.BadRequest(_('Failed to make the request to asana api'))
+            raise exc.BadRequest(_('Failed to make the request to Asana API'))
         return response.Ok(projects)
 
     @list_route(methods=["POST"])
@@ -128,8 +128,8 @@ class AsanaImporterViewSet(viewsets.ViewSet):
         try:
             asana_token = AsanaImporter.get_access_token(code, settings.ASANA_APP_ID, settings.ASANA_APP_SECRET, settings.ASANA_APP_CALLBACK_URL)
         except exceptions.InvalidRequest:
-            raise exc.BadRequest(_('Invalid asana api request'))
+            raise exc.BadRequest(_('Invalid Asana API request'))
         except exceptions.FailedRequest:
-            raise exc.BadRequest(_('Failed to make the request to asana api'))
+            raise exc.BadRequest(_('Failed to make the request to Asana API'))
 
         return response.Ok({"token": asana_token})
diff --git a/taiga/importers/asana/tasks.py b/taiga/importers/asana/tasks.py
index 5d36bed9..4dcef793 100644
--- a/taiga/importers/asana/tasks.py
+++ b/taiga/importers/asana/tasks.py
@@ -39,14 +39,14 @@ def import_project(self, user_id, token, project_id, options):
         # Error
         ctx = {
             "user": user,
-            "error_subject": _("Error importing asana project"),
-            "error_message": _("Error importing asana project"),
+            "error_subject": _("Error importing Asana project"),
+            "error_message": _("Error importing Asana project"),
             "project": project_id,
             "exception": e
         }
         email = mail_builder.asana_import_error(admin, ctx)
         email.send()
-        logger.error('Error importing asana project %s (by %s)', project_id, user, exc_info=sys.exc_info())
+        logger.error('Error importing Asana project %s (by %s)', project_id, user, exc_info=sys.exc_info())
     else:
         ctx = {
             "project": project,
diff --git a/taiga/importers/github/tasks.py b/taiga/importers/github/tasks.py
index f1069e9e..c3cf16f8 100644
--- a/taiga/importers/github/tasks.py
+++ b/taiga/importers/github/tasks.py
@@ -39,14 +39,14 @@ def import_project(self, user_id, token, project_id, options):
         # Error
         ctx = {
             "user": user,
-            "error_subject": _("Error importing github project"),
-            "error_message": _("Error importing github project"),
+            "error_subject": _("Error importing GitHub project"),
+            "error_message": _("Error importing GitHub project"),
             "project": project_id,
             "exception": e
         }
         email = mail_builder.github_import_error(admin, ctx)
         email.send()
-        logger.error('Error importing github project %s (by %s)', project_id, user, exc_info=sys.exc_info())
+        logger.error('Error importing GitHub project %s (by %s)', project_id, user, exc_info=sys.exc_info())
     else:
         ctx = {
             "project": project,
diff --git a/taiga/importers/jira/tasks.py b/taiga/importers/jira/tasks.py
index a1551f1b..874aca49 100644
--- a/taiga/importers/jira/tasks.py
+++ b/taiga/importers/jira/tasks.py
@@ -44,14 +44,14 @@ def import_project(self, user_id, url, token, project_id, options, importer_type
         # Error
         ctx = {
             "user": user,
-            "error_subject": _("Error importing jira project"),
-            "error_message": _("Error importing jira project"),
+            "error_subject": _("Error importing Jira project"),
+            "error_message": _("Error importing Jira project"),
             "project": project_id,
             "exception": e
         }
         email = mail_builder.jira_import_error(admin, ctx)
         email.send()
-        logger.error('Error importing jira project %s (by %s)', project_id, user, exc_info=sys.exc_info())
+        logger.error('Error importing Jira project %s (by %s)', project_id, user, exc_info=sys.exc_info())
     else:
         ctx = {
             "project": project,
diff --git a/taiga/importers/pivotal/tasks.py b/taiga/importers/pivotal/tasks.py
index 2e8f54ea..b9954201 100644
--- a/taiga/importers/pivotal/tasks.py
+++ b/taiga/importers/pivotal/tasks.py
@@ -39,14 +39,14 @@ def import_project(self, user_id, token, project_id, options):
         # Error
         ctx = {
             "user": user,
-            "error_subject": _("Error importing pivotal project"),
-            "error_message": _("Error importing pivotal project"),
+            "error_subject": _("Error importing PivotalTracker project"),
+            "error_message": _("Error importing PivotalTracker project"),
             "project": project_id,
             "exception": e
         }
         email = mail_builder.pivotal_import_error(admin, ctx)
         email.send()
-        logger.error('Error importing pivotal project %s (by %s)', project_id, user, exc_info=sys.exc_info())
+        logger.error('Error importing PivotalTracker project %s (by %s)', project_id, user, exc_info=sys.exc_info())
     else:
         ctx = {
             "project": project,
diff --git a/taiga/importers/trello/tasks.py b/taiga/importers/trello/tasks.py
index 76f7f197..1cb2fe32 100644
--- a/taiga/importers/trello/tasks.py
+++ b/taiga/importers/trello/tasks.py
@@ -39,14 +39,14 @@ def import_project(self, user_id, token, project_id, options):
         # Error
         ctx = {
             "user": user,
-            "error_subject": _("Error importing trello project"),
-            "error_message": _("Error importing trello project"),
+            "error_subject": _("Error importing Trello project"),
+            "error_message": _("Error importing Trello project"),
             "project": project_id,
             "exception": e
         }
         email = mail_builder.trello_import_error(admin, ctx)
         email.send()
-        logger.error('Error importing trello project %s (by %s)', project_id, user, exc_info=sys.exc_info())
+        logger.error('Error importing Trello project %s (by %s)', project_id, user, exc_info=sys.exc_info())
     else:
         ctx = {
             "project": project,
diff --git a/taiga/locale/en/LC_MESSAGES/django.po b/taiga/locale/en/LC_MESSAGES/django.po
index 757246c6..53faaa9f 100644
--- a/taiga/locale/en/LC_MESSAGES/django.po
+++ b/taiga/locale/en/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: taiga-back\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2017-02-09 09:12+0100\n"
+"POT-Creation-Date: 2017-02-15 12:07+0100\n"
 "PO-Revision-Date: 2015-03-25 20:09+0100\n"
 "Last-Translator: Taiga Dev Team <support@taiga.io>\n"
 "Language-Team: Taiga Dev Team <support@taiga.io>\n"
@@ -184,8 +184,8 @@ msgstr ""
 #: taiga/projects/api.py:754 taiga/projects/epics/api.py:200
 #: taiga/projects/epics/api.py:284 taiga/projects/issues/api.py:224
 #: taiga/projects/mixins/ordering.py:59 taiga/projects/tasks/api.py:247
-#: taiga/projects/tasks/api.py:272 taiga/projects/userstories/api.py:322
-#: taiga/projects/userstories/api.py:374 taiga/webhooks/api.py:71
+#: taiga/projects/tasks/api.py:272 taiga/projects/userstories/api.py:323
+#: taiga/projects/userstories/api.py:375 taiga/webhooks/api.py:71
 msgid "Blocked element"
 msgstr ""
 
@@ -764,7 +764,7 @@ msgstr ""
 
 #: taiga/external_apps/models.py:39 taiga/projects/attachments/models.py:62
 #: taiga/projects/custom_attributes/models.py:37
-#: taiga/projects/epics/models.py:55
+#: taiga/projects/epics/models.py:56
 #: taiga/projects/history/templatetags/functions.py:25
 #: taiga/projects/issues/models.py:60 taiga/projects/models.py:152
 #: taiga/projects/models.py:739 taiga/projects/tasks/models.py:62
@@ -801,7 +801,7 @@ msgstr ""
 #: taiga/feedback/models.py:31 taiga/projects/attachments/models.py:48
 #: taiga/projects/contact/models.py:34
 #: taiga/projects/custom_attributes/models.py:46
-#: taiga/projects/epics/models.py:48 taiga/projects/issues/models.py:52
+#: taiga/projects/epics/models.py:49 taiga/projects/issues/models.py:52
 #: taiga/projects/likes/models.py:33 taiga/projects/milestones/models.py:48
 #: taiga/projects/models.py:159 taiga/projects/models.py:743
 #: taiga/projects/notifications/models.py:89 taiga/projects/tasks/models.py:48
@@ -861,7 +861,7 @@ msgstr ""
 
 #: taiga/hooks/api.py:63 taiga/projects/epics/api.py:154
 #: taiga/projects/issues/api.py:139 taiga/projects/tasks/api.py:201
-#: taiga/projects/userstories/api.py:276
+#: taiga/projects/userstories/api.py:277
 msgid "The project doesn't exist"
 msgstr ""
 
@@ -949,6 +949,85 @@ msgstr ""
 msgid "The status doesn't exist"
 msgstr ""
 
+#: taiga/importers/asana/api.py:44 taiga/importers/asana/api.py:86
+#: taiga/importers/github/api.py:45 taiga/importers/github/api.py:75
+#: taiga/importers/jira/api.py:56 taiga/importers/jira/api.py:102
+#: taiga/importers/pivotal/api.py:44 taiga/importers/pivotal/api.py:81
+#: taiga/importers/trello/api.py:46 taiga/importers/trello/api.py:83
+msgid "The project param is needed"
+msgstr ""
+
+#: taiga/importers/asana/api.py:51 taiga/importers/asana/api.py:74
+#: taiga/importers/asana/api.py:131
+msgid "Invalid Asana API request"
+msgstr ""
+
+#: taiga/importers/asana/api.py:53 taiga/importers/asana/api.py:76
+#: taiga/importers/asana/api.py:133
+msgid "Failed to make the request to Asana API"
+msgstr ""
+
+#: taiga/importers/asana/api.py:126 taiga/importers/github/api.py:121
+msgid "Code param needed"
+msgstr ""
+
+#: taiga/importers/asana/tasks.py:42 taiga/importers/asana/tasks.py:43
+msgid "Error importing Asana project"
+msgstr ""
+
+#: taiga/importers/github/api.py:129
+msgid "Invalid auth data"
+msgstr ""
+
+#: taiga/importers/github/api.py:131
+msgid "Third party service failing"
+msgstr ""
+
+#: taiga/importers/github/tasks.py:42 taiga/importers/github/tasks.py:43
+msgid "Error importing GitHub project"
+msgstr ""
+
+#: taiga/importers/jira/api.py:58 taiga/importers/jira/api.py:85
+#: taiga/importers/jira/api.py:105 taiga/importers/jira/api.py:178
+msgid "The url param is needed"
+msgstr ""
+
+#: taiga/importers/jira/api.py:154
+msgid "Invalid project_type {}"
+msgstr ""
+
+#: taiga/importers/jira/api.py:224 taiga/importers/pivotal/api.py:139
+#: taiga/importers/trello/api.py:143
+msgid "Invalid or expired auth token"
+msgstr ""
+
+#: taiga/importers/jira/tasks.py:47 taiga/importers/jira/tasks.py:48
+msgid "Error importing Jira project"
+msgstr ""
+
+#: taiga/importers/pivotal/tasks.py:42 taiga/importers/pivotal/tasks.py:43
+msgid "Error importing PivotalTracker project"
+msgstr ""
+
+#: taiga/importers/trello/importer.py:77
+#, python-format
+msgid "Invalid Request: %s at %s"
+msgstr ""
+
+#: taiga/importers/trello/importer.py:79 taiga/importers/trello/importer.py:81
+#, python-format
+msgid "Unauthorized: %s at %s"
+msgstr ""
+
+#: taiga/importers/trello/importer.py:83 taiga/importers/trello/importer.py:85
+#, python-format
+msgid "Resource Unavailable: %s at %s"
+msgstr ""
+
+#: taiga/importers/trello/tasks.py:42 taiga/importers/trello/tasks.py:43
+msgid "Error importing Trello project"
+msgstr ""
+
 #: taiga/permissions/choices.py:23 taiga/permissions/choices.py:34
 msgid "View project"
 msgstr ""
@@ -1134,7 +1213,7 @@ msgid "Fans"
 msgstr ""
 
 #: taiga/projects/admin.py:144 taiga/projects/attachments/models.py:39
-#: taiga/projects/epics/models.py:39 taiga/projects/issues/models.py:37
+#: taiga/projects/epics/models.py:40 taiga/projects/issues/models.py:37
 #: taiga/projects/milestones/models.py:42 taiga/projects/models.py:164
 #: taiga/projects/notifications/models.py:62 taiga/projects/tasks/models.py:39
 #: taiga/projects/userstories/models.py:69 taiga/projects/wiki/models.py:40
@@ -1217,7 +1296,7 @@ msgstr ""
 
 #: taiga/projects/attachments/models.py:41 taiga/projects/contact/models.py:29
 #: taiga/projects/custom_attributes/models.py:43
-#: taiga/projects/epics/models.py:37 taiga/projects/issues/models.py:50
+#: taiga/projects/epics/models.py:38 taiga/projects/issues/models.py:50
 #: taiga/projects/milestones/models.py:44 taiga/projects/models.py:506
 #: taiga/projects/models.py:528 taiga/projects/models.py:565
 #: taiga/projects/models.py:593 taiga/projects/models.py:619
@@ -1240,7 +1319,7 @@ msgstr ""
 
 #: taiga/projects/attachments/models.py:51
 #: taiga/projects/custom_attributes/models.py:48
-#: taiga/projects/epics/models.py:51 taiga/projects/issues/models.py:55
+#: taiga/projects/epics/models.py:52 taiga/projects/issues/models.py:55
 #: taiga/projects/milestones/models.py:51 taiga/projects/models.py:162
 #: taiga/projects/models.py:746 taiga/projects/tasks/models.py:51
 #: taiga/projects/userstories/models.py:90 taiga/projects/wiki/models.py:47
@@ -1266,7 +1345,7 @@ msgstr ""
 
 #: taiga/projects/attachments/models.py:63
 #: taiga/projects/custom_attributes/models.py:41
-#: taiga/projects/epics/models.py:101 taiga/projects/milestones/models.py:57
+#: taiga/projects/epics/models.py:104 taiga/projects/milestones/models.py:57
 #: taiga/projects/models.py:522 taiga/projects/models.py:555
 #: taiga/projects/models.py:589 taiga/projects/models.py:613
 #: taiga/projects/models.py:645 taiga/projects/models.py:665
@@ -1409,26 +1488,26 @@ msgstr ""
 msgid "You don't have permissions to set this status to this epic."
 msgstr ""
 
-#: taiga/projects/epics/models.py:35 taiga/projects/issues/models.py:35
+#: taiga/projects/epics/models.py:36 taiga/projects/issues/models.py:35
 #: taiga/projects/tasks/models.py:37 taiga/projects/userstories/models.py:62
 msgid "ref"
 msgstr ""
 
-#: taiga/projects/epics/models.py:42 taiga/projects/issues/models.py:39
+#: taiga/projects/epics/models.py:43 taiga/projects/issues/models.py:39
 #: taiga/projects/tasks/models.py:41 taiga/projects/userstories/models.py:72
 msgid "status"
 msgstr ""
 
-#: taiga/projects/epics/models.py:45
+#: taiga/projects/epics/models.py:46
 msgid "epics order"
 msgstr ""
 
-#: taiga/projects/epics/models.py:54 taiga/projects/issues/models.py:59
+#: taiga/projects/epics/models.py:55 taiga/projects/issues/models.py:59
 #: taiga/projects/tasks/models.py:55 taiga/projects/userstories/models.py:94
 msgid "subject"
 msgstr ""
 
-#: taiga/projects/epics/models.py:58 taiga/projects/models.py:526
+#: taiga/projects/epics/models.py:59 taiga/projects/models.py:526
 #: taiga/projects/models.py:561 taiga/projects/models.py:617
 #: taiga/projects/models.py:647 taiga/projects/models.py:667
 #: taiga/projects/models.py:691 taiga/projects/models.py:719
@@ -1436,23 +1515,28 @@ msgstr ""
 msgid "color"
 msgstr ""
 
-#: taiga/projects/epics/models.py:61 taiga/projects/issues/models.py:63
+#: taiga/projects/epics/models.py:62 taiga/projects/issues/models.py:63
 #: taiga/projects/tasks/models.py:65 taiga/projects/userstories/models.py:98
 msgid "assigned to"
 msgstr ""
 
-#: taiga/projects/epics/models.py:63 taiga/projects/userstories/models.py:100
+#: taiga/projects/epics/models.py:64 taiga/projects/userstories/models.py:100
 msgid "is client requirement"
 msgstr ""
 
-#: taiga/projects/epics/models.py:65 taiga/projects/userstories/models.py:102
+#: taiga/projects/epics/models.py:66 taiga/projects/userstories/models.py:102
 msgid "is team requirement"
 msgstr ""
 
-#: taiga/projects/epics/models.py:69
+#: taiga/projects/epics/models.py:70
 msgid "user stories"
 msgstr ""
 
+#: taiga/projects/epics/models.py:72 taiga/projects/issues/models.py:66
+#: taiga/projects/tasks/models.py:70 taiga/projects/userstories/models.py:109
+msgid "external reference"
+msgstr ""
+
 #: taiga/projects/epics/validators.py:37
 msgid "There's no epic with that id"
 msgstr ""
@@ -1635,11 +1719,6 @@ msgstr ""
 msgid "finished date"
 msgstr ""
 
-#: taiga/projects/issues/models.py:66 taiga/projects/tasks/models.py:70
-#: taiga/projects/userstories/models.py:109
-msgid "external reference"
-msgstr ""
-
 #: taiga/projects/likes/models.py:36
 msgid "Like"
 msgstr ""
@@ -3307,25 +3386,25 @@ msgstr ""
 msgid "Stakeholder"
 msgstr ""
 
-#: taiga/projects/userstories/api.py:127
+#: taiga/projects/userstories/api.py:128
 msgid "You don't have permissions to set this sprint to this user story."
 msgstr ""
 
-#: taiga/projects/userstories/api.py:131
+#: taiga/projects/userstories/api.py:132
 msgid "You don't have permissions to set this status to this user story."
 msgstr ""
 
-#: taiga/projects/userstories/api.py:221
+#: taiga/projects/userstories/api.py:222
 #, python-brace-format
 msgid "Invalid role id '{role_id}'"
 msgstr ""
 
-#: taiga/projects/userstories/api.py:228
+#: taiga/projects/userstories/api.py:229
 #, python-brace-format
 msgid "Invalid points id '{points_id}'"
 msgstr ""
 
-#: taiga/projects/userstories/api.py:243
+#: taiga/projects/userstories/api.py:244
 #, python-brace-format
 msgid "Generating the user story #{ref} - {subject}"
 msgstr ""
diff --git a/tests/integration/test_importers_asana_api.py b/tests/integration/test_importers_asana_api.py
index bc158694..aab4d143 100644
--- a/tests/integration/test_importers_asana_api.py
+++ b/tests/integration/test_importers_asana_api.py
@@ -95,7 +95,7 @@ def test_authorize_with_bad_verify(client, settings):
     assert response.status_code == 400
     assert 'token' not in response.data
     assert '_error_message' in response.data
-    assert response.data['_error_message'] == "Invalid asana api request"
+    assert response.data['_error_message'] == "Invalid Asana API request"
 
 
 def test_import_asana_list_users(client):