Principles of removal:
1. Don't translate common symbols such as mm/s, °C, etc.,
they are the same in most languages.
2. Don't translate professional terminology, such as CoreXY,
I3, PLA, TPU, HMS, etc.
3. Don't use unicode codes, use symbols instead. Eg. \u2103 -> °C.
Dont' worry, gettext and modern compilers can recognize them.
4. Fix some encoding warnings (don't use GB2312, use UTF-8 instead).
jira: none
Change-Id: Ifa847d4f32a6f8dcba660ae2026ad09fc914c7fb
Arthur
lane.wei