Unify po headers

The script is placed here (currently):
wiki/src/contribute/l10n_tricks/unify_po-headers.py

old script for reference: wiki/src/contribute/l10n_tricks/check_po.sh

Environment

• at developers computer for checking/unifing their po files.
• at Jenkins to check all po files. wiki/src po files have other rules than other po files.
• a malicious users try to trick this script
• as core devs need to review random review requests against tails repository, the scrip itself can’t live in the same repository nor submodule, as otherwise a malicious users can get into control of a core devs’ computer.

Expectations

• never screws up the host system
• status code is reflecting if any error was detected in po files
• it does not get triggerd by freshly created/updated po files by ikiwiki (Author: IkiWiki <ikiwiki.info>)
• only modify any file, when --modify is given.
• output should be clear enough for humans to understand, where an issue was detected.

Feature Branch: https://salsa.debian.org/tails-team/tails/merge_requests/14

Attachments

• flake8.diff

Parent Task: #15079 (closed)

Related issues

• Related to #15364 (closed)
• Related to #16102 (closed)
• Related to #15819 (closed)
• Blocked by #15605 (closed)

Original created by @u on 15403 (Redmine)