fix: docs title underline too short

Author: neznaika0

user_guide_src/source/outgoing/localization.rst

@@ -370,7 +370,7 @@ Detailed information can be found by running the command:
 .. _sync-translations-command:
 
 Synchronization  Translation Files via Command
-========================================
+==============================================
 
 .. versionadded:: 4.6.0