Corrected:
MSG_KILLED
MSG_NO_MOVE
MSG_STOPPED
MSG_PRINT_ABORTED
MSG_ON
MSG_OFF

Added translation mentioned in issue #3351:
Homing would be best tranlated homing, or "Kører til udgangsposition".

#define MSG_SET_HOME_OFFSETS
#define MSG_LEVEL_BED_HOMING
#define MSG_LEVEL_BED_WAITING 
#define MSG_LEVEL_BED_DONE
#define MSG_LEVEL_BED_CANCEL 
#define MSG_HOME_OFFSETS_APPLIED

Optimised all added messages to fit within 16 Characters

Only measure and store filament width when E is going forward.

I think that that sentence has been completed its part. 
Because Kana fonts were revised by me the other day(PR #3289), who am a native Japanese.

And for @AnHardt,
I'd like to take this opportunity to express one's heartfelt gratitude as a far eastern person,
about you has been maintaining the resource of Japanese despite you are a far western person.

New messages translated:
#define MSG_LEVEL_BED_HOMING "Homing XYZ"
#define MSG_LEVEL_BED_WAITING "Click to Begin"
#define MSG_LEVEL_BED_DONE "Leveling Done!"
#define MSG_LEVEL_BED_CANCEL "Cancel"
. . .
#define MSG_HOME_OFFSETS_APPLIED "Offsets applied"

Add the missing translation (Spanish) issue #3353

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

ADD missing translation

This is follow-up the commit e5771346a4.
Update unnoticed files.

As noted by @taratata2016 in https://github.com/MarlinFirmware/Marlin/issues/3300#issuecomment-204687275