Apply translations for 2.4 strings

This includes translations that were missing translations, with varying
extent between different languages, for the following things:
- "X mode is enabled" in-game warnings
- "Press {button} to freeze/unfreeze gameplay" for the level debugger
- Some credits strings for the post-2.4.0 extra Spanish options, the
  PT_BR proofread, and Persian
- The recent gamepad menu changes (#1229)

Furthermore:
- "TAB" (used in the level debugger string) is now a separate string
  instead of being hardcoded, because some languages needed it
  translated
- Added missing arrows to Arabic/Persian font (needed for the gamepad
  menu, and also a translator menu actually)

desktop_version/src/LevelDebugger.cpp

@@ -459,7 +459,7 @@ namespace level_debugger
             buffer, sizeof(buffer),
             text,
             "button:str",
-            "TAB"
+            loc::gettext("TAB")
         );
 
         font::print(PR_BOR, 5, 14, buffer, 220 - (help.glow), 220 - (help.glow), 255 - (help.glow / 2));