Save PROGMEM with string changes

Unlike RAM-based strings, PROGMEM strings aren’t consolidated by the
compiler.

Add placeholders for Bulgarian translation

Update Croatian to include missing strings

Added all missing strings according to English

Fix hotend offset report in M503

Enhance findMissingTranslations, format the output

[LANGUAGE] Update Czech (Case light)

Update language_de.h

Added missing translations

Follow-up to #5330

Grammar corrections

Allow case light pin to be active low

Allow UART ISRs inside the stepper ISR

Fix redraw in SD Card menus

Fix for the PR #5072 (Add predefined AUTO_FAN_PINs to pins files), etc

Fix compile without ENABLE_LEVELING_FADE_HEIGHT

Support for an RGB LED using 3 pins

・Update forgotten Configuration_adv.h of Felix\DUAL and K8400\Dual-head

・Make descriptions the same as others

Adding ukrainian language support

Suppress warning

to capture chars at UART at 250000 baud.

.. and give the hint to try lower values if possible.

Support for COREYX, COREZX, COREZY

Improvement for ENSURE_SMOOTH_MOVES

Add a fade factor for mesh leveling

Keep drawing menu unless screen changes

Refine material heatup menu items

Fix and optimize case-light code

MENU_HOLLOW_FRAME for the menu screens