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/lang/en/strings.xml

@@ -229,6 +229,7 @@
     <string english="E" translation="" explanation="keyboard key E. Speedrunner options menu"/>
     <string english="ENTER" translation="" explanation="keyboard key ENTER. Speedrunner options menu"/>
     <string english="ESC" translation="" explanation="keyboard key ESC"/>
+    <string english="TAB" translation="" explanation="keyboard key TAB"/>
     <string english="ACTION" translation="" explanation="the ACTION key is either the SPACE key, Z or V (this is explained on the title screen). It's used in strings like `Press ACTION to advance text`"/>
     <string english="Interact button: {button}" translation="" explanation="keyboard key (E or ENTER) is filled in for {button}. Speedrunner options menu" max="38*2"/>
     <string english="fake load screen" translation="" explanation="menu option"/>