[Feature Request] Add Translator Comments

[WenSimEHRP]

Motivation

The current version of the web translator doesn't allow adding comments.

In some cases, comments are necessary, e.g., the target language doesn't have a similar word, and it must be replaced with a different one.

Another example is breakers, in which they are " " (spaces, or {ZWSP}, if it is going to be added to the game). Sometimes the English language uses {NBSP} to prevent breaking the string, but in other languages (e.g., zh_CN and zh_TW), there are no breakers, and breaking the string is acceptable.