Make .ui file names match .c filenames

This only leaves the remaining inconsistently named .ui files:

  • datetime: pages for differing date endianess, would need to be refactored if appropriate.
  • mouse: Solved in !283 (merged)
  • network: Not attempted as @feaneron is planning to refactor.
  • printers: Not attempted due to having momentum solving other structural issues.
  • wacom: Needs some refactoring as .ui files are loaded in multiple places.

Merge request reports