Add an option to the update command to exclude src line comments in .po files

[edaena]

Currently when using the update command the .po file is updated with comments indicating the lines in the src file. Eg. #: myFile.ts:355. This causes differences in source control when doing trivial changes to the src file that are unrelated to the translation strings.

Expected:
A flag to update without automatically adding those comments.

Suggestion:
A flag called --format where, similar to the po2json we can specify compact or verbose, where compact will be without src line comments.