Adjust check_po to ignore more plural form errors
The reason behind c4a0ac1 is still preventing us from fixing #9992 (closed).
We should:
- Run check_po with i18nspector from both Debian stable and testing/sid on everything we can: at least our main repository, and ideally a few more ones like the Greeter and Installer ones (after reverting the commits that drop PO files due to plural form errors).
- Add, to the list of expections, all plural form -related tags that we want to ignore (note that some tags were added/renamed between 0.17 and 0.23, for example; see upstream changelog for details), until the output is clear of false positives.
- Make sure the PO files we disabled because of plural form errors (that we now consider as false positives) are integrated back, for example ru.po in Tails Greeter.
Related issues
- Related to #10747 (closed)
- Has duplicate #9992 (closed)
Original created by @sajolida on 11081 (Redmine)