Merge pull request #1693 from return42/fix-1692

[fix] Internal server error after changing UI language to BG

searx/translations/bg/LC_MESSAGES/messages.po

@@ -241,7 +241,7 @@ msgstr "Функции за статистика"
 
 #: searx/answerers/statistics/answerer.py:48
 msgid "Compute {functions} of the arguments"
-msgstr "Изчислете {функции} на аргументите"
+msgstr "Изчислете {functions} на аргументите"
 
 #: searx/engines/openstreetmap.py:160
 msgid "Get directions"