Optimised all added messages to fit within 16 Characters

Added these messages with Dutch translation
#define MSG_BED_Z
#define MSG_A_TRAVEL
#define MSG_HEATING_FAILED_LCD
#define MSG_ERR_REDUNDANT_TEMP
#define MSG_THERMAL_RUNAWAY
#define MSG_ERR_MAXTEMP
#define MSG_ERR_MINTEMP
#define MSG_ERR_MAXTEMP_BED
#define MSG_ERR_MINTEMP_BED
#define MSG_HEATING
#define MSG_HEATING_COMPLETE
#define MSG_BED_HEATING
#define MSG_BED_DONE

In all these cases we want the axis to be homed. If we could have lost
some steps is secondary.

Reenables homing seperate axis with DISABLE_X / DISABLE_Y true.

Following up on #3231

documentation/LCDLanguageFont.md moved to http://www.marlinfirmware.org/ at commit 12d0983757,
but http://www.marlinfirmware.org/ isn't working.

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.

* Depending on extruder count, will add menu items for ultralcd to edit
individual PID parameters for each extruder
* Added menu items to each language_xx.h
* Builds OK, but recommend testing with typical LCD

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.