Update index lang files

app/lang/en/index.po

@@ -12,9 +12,6 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Language: en\n"
 
-msgid "Topics"
-msgstr "Topics"
-
 msgid "Empty board"
 msgstr "Board is empty."
 

app/lang/ru/index.po

@@ -12,9 +12,6 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Language: ru\n"
 
-msgid "Topics"
-msgstr "Тем"
-
 msgid "Empty board"
 msgstr "Форум пуст."