String and translation fixes

[lemondrops]

Summary

• Fix the Covox Sound Master IRQ/DMA selection text being different from other similar selectors
• Add plural form support for a few strings
• Un-hardcode the ROM set URL and emulator name in the "missing ROMs" message and made it point to a specific ROM set version in release builds
• Remove the # sign from sound card dropdown labels for consistency
• Russian translation: Change joystick names (except gamepads) to be more in line with Russian Windows 98 SE localization
• Use native names for languages in the language selector
• Overhaul the ui_msgbox API:
  • MBX_ERROR and MBX_FATAL now set default dialog box title to "Error" and "Fatal error" respectively, restoring the old Win32 UI's behavior
  • Fix icon choice: MBX_WARNING now actually uses the warning icon
  • Revise and adjust icons for some existing message boxes
• Many message boxes (ones shown by request from the emulator core as well as ones shown in the ahrd disk dialog) have been re-formatted with important information being moved out of the title; this was a leftover from when they used native Vista+ TaskDialogs
• Make more error messages translatable
• Fix the hard disk overwrite warning not being shown
• Fix message boxes shown early on startup not being translated
• Add translation support for floppy drive types
• Consistency fixes for decimal separators

Checklist

• Closes #xxx
• I have tested my changes locally and validated that the functionality works as intended
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
• This pull request requires changes to the asset set

References

N/A