Add
MSG_BLTOUCH                    
MSG_DELTA_SETTINGS            
MSG_UBL_MESH_EDIT                
MSG_UBL_OUTPUT_MAP_BACKUP        
MSG_UBL_STEP_BY_STEP_MENU       
MSG_Z_FADE_HEIGHT

Following #6990 some more translations and some grammar fixes

There was quite a lot to translate this time. I'm not absolutely confident with the whole UBL stuff and it's a PITA to translate. I don't use any kind of levelling myself as i just have a perfectly level cast aluminium plate as bed.
So maybe someone who really uses it might take a closer look at it after it's merged.

* Unify M600 and M125 pause features
* Cleanup per thinkyhead's comments
* Rename filament_change_menu_response to advanced_pause_menu_response
* Include HAS_BED_PROBE in QUIET_PROBING
* Update gMax example file
* is_idle() is out of scope without the braces
* Convert FT-i3-2020 to Advance Pause names...
* Allow pause even if not printing

There are some quite tricky ones which are hardly translateable.
Maybe @Sebastianv650 can review this

Addition of missing strings to match language_en.h

Small corrections

Added tarnslation for
```
#define MSG_DEBUG_MENU 
#define MSG_PROGRESS_BAR_TEST
```

- Japanese and Chinese still need update

Add symbol-string for _de
to reduce the frquencey of regenerating 'mappers' and 'fonts'
with the new utf-system.

#define MSG_ENDSTOP_ABORT  doesn't fit in Display 
See https://github.com/MarlinFirmware/Marlin/issues/5401#issuecomment-265714487

Grammar corrections

Made Filament change Text sound like correct german.

Change some string to get a better wording in german

@MarlinFirmware/language-team updated german languagefile to the latest english version

MSG_MOVE_E1 was missing
MSG_MOVE_E2 was missing
MSG_MOVE_E3 was missing
MSG_MOVE_E4 was missing

I assigned "0" to "MSG_MOVE_E1", "1" to "MSG_MOVE_E2" and so on, as this is what i assume to be the standard naming for the first (E0) and second (E1) extruder. This would have to be changed inthe other languages too :(

Added german translation for MSG_INFO_PRINT_LONGEST and  MSG_INFO_PRINT_FILAMENT.
MSG_HEATING_COMPLETE changed from "Aufgeheizt" to "Extr. aufgeheizt"
MSG_HEATING changed from "Aufheizen" to "Extr. aufheizen"

・Remove MSG_END_HOUR and MSG_END_MINUTE from all the language files
・Change from MSG_INFO_TOTAL_PRINTS to MSG_INFO_PRINT_COUNT in German
file

@MarlinFirmware/language-team my changes for the German language. Feel free to improve :)

There is no way to translate "A-travel" to "A Rückzug". Thats simply
wrong.

We don't have to  avoid German "Umlaute" any more.