Handle locale fail

server/newsteaser/schema_public.py

@@ -16,9 +16,41 @@ class NewsTeaserNode(DjangoObjectType):
         filter_fields = ['date',]
         interfaces = (relay.Node,)
 
+    def _month_to_german_string(self, date):
+        if date == 1:
+            month = 'Januar'
+        elif date == 2:
+            month = 'Februar'
+        elif date == 3:
+            month = 'März'
+        elif date == 4:
+            month = 'April'
+        elif date == 5:
+            month = 'Mai'
+        elif date == 6:
+            month = 'Juni'
+        elif date == 7:
+            month = 'Juli'
+        elif date == 8:
+            month = 'August'
+        elif date == 9:
+            month = 'September'
+        elif date == 10:
+            month = 'Oktober'
+        elif date == 11:
+            month = 'November'
+        elif date == 12:
+            month = 'Dezember'
+        return month
+
     def resolve_display_date(self, *args, **kwargs):
-        locale.setlocale(locale.LC_TIME, "de_DE")
-        return self.date.strftime("%d. %B %Y")
+        # play it safe, locale might not be installed in platform
+        try:
+            locale.setlocale(locale.LC_TIME, "de_DE")
+            return self.date.strftime("%-d. %B %Y")
+        except:
+            month = self._month_to_german_string(self.date)
+            return f'{self.date.day}. {month}. {self.date.year}'
 
 
 class AllNewsTeasersQuery(object):