Round percentages even with Python 3

With Python 2 the calculation is automatically truncated to integer,
with Python 3 we need to round it.

Fixes #1055
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/util.py

@@ -176,7 +176,7 @@ def translation_percent(translated, total):
     '''
     Returns translation percentage.
     '''
-    return (1000 * translated / total) / 10.0
+    return round(1000 * translated / total) / 10.0
 
 
 def add_configuration_error(name, message):