[1.6.x] Fixed #23267 -- Fixed typo in Translation documentation

Thanks to Tomin1 for the report.

Backport of 2e7be92b4df29ac851d570e57da5dcf756c5ac52 from master.
[1.6.x] Added a warning that remove_tags() output shouldn't be considered safe.

Backport of 7efce77de2 from master