Add source check for more failing checks (closes #385)

docs/user/checks.rst

@@ -236,3 +236,15 @@ The string uses three dots (...) instead of an ellipsis character (…). Using
 Unicode character is in most cases better approach and looks better.
 
 .. seealso:: https://en.wikipedia.org/wiki/Ellipsis
+
+.. _check-multiple-failures:
+
+Multiple failing checks
+~~~~~~~~~~~~~~~~~~~~~~~
+
+More translations of this string have some failed quality checks. This is
+usually indication that something could be done about improving the source
+string. 
+
+This check can be quite often caused by missing full stop at the end of
+sentence or similar minor issues which translators tend to fix in translations.

trans/checks/source.py

@@ -55,3 +55,24 @@ class EllipsisCheck(SourceCheck):
 
     def check_source(self, source, unit):
         return '...' in source[0]
+
+
+class MultipleFailingCheck(SourceCheck):
+    '''
+    Checks whether there are more failing checks on this translation.
+    '''
+    check_id = 'multiple_failures'
+    name = _('Multiple failing checks')
+    description = _(
+        'Translation in several languages have failing checks.'
+    )
+
+    def check_source(self, source, unit):
+        from trans.models.unitdata import Check
+        related = Check.objects.filter(
+            contentsum=unit.contentsum,
+            project=unit.translation.subproject.project
+        ).exclude(
+            language__isnull=True
+        )
+        return related.count() > 2

weblate/appsettings.py

@@ -116,6 +116,7 @@ CHECK_LIST = get('CHECK_LIST', (
     'trans.checks.markup.XMLTagsCheck',
     'trans.checks.source.OptionalPluralCheck',
     'trans.checks.source.EllipsisCheck',
+    'trans.checks.source.MultipleFailingCheck',
 ))
 
 # List of automatic fixups

weblate/settings_example.py

@@ -449,6 +449,7 @@ WHOOSH_INDEX = os.path.join(WEB_ROOT, 'whoosh-index')
 #    'trans.checks.markup.XMLTagsCheck',
 #    'trans.checks.source.OptionalPluralCheck',
 #    'trans.checks.source.EllipsisCheck',
+#    'trans.checks.source.MultipleFailingCheck',
 #)
 
 # List of automatic fixups