Keep "astyled" reformatting

Apply `ENABLED` / `DISABLED` macros to language-related files.

* Added MSG_END_HOUR and MSG_END_MINUTE labels to all language files.
* Available translations:
  EN, FR, DE, ES, IT, PT, PT-BR.

Automatic selection was to unflexible.

Updated documentation

Updated language files to new logic and documentation.

Updated bdf2u8g.exe

This won’t reduce the string storage in the end, but it makes the
language files smaller. Also removed remaining unused strings.

This reverts commit 2b9722f387.

To test/enable, uncomment the #define DELTA_CALIBRATION_MENU in Configuration.h

Breaking up languages.h makes it easier to translate. Using language
codes makes it easier to select a language and sets the naming standard.