Always convert to int before comparing

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/templatetags/translations.py

@@ -139,7 +139,7 @@ def format_translation(value, language, diff=None, search_match=None,
     plurals = split_plural(value)
 
     # Show plurals?
-    if num_plurals <= 1:
+    if int(num_plurals) <= 1:
         plurals = plurals[:1]
 
     # Newline concatenator