Remove r from lang names as per Fastlane requirement

[ArnyminerZ]

Purpose

See #771 and https://gitlab.com/fdroid/fdroiddata/-/issues/2323

Short description

Remove r from locales in Fastlane following BCP47 as per Fastlane requirement.

• I've noticed that some languages were duplicated with and without r, with the same content, so I've removed the versions with r. Affected locales: en-rGB, fr-rFR, zh-rTW.
• Moved pt-rBR to pt-BR.

Checklist

• The PR has a proper title, description and label.
• I have self-reviewed the PR.
• I have added documentation to complex functions and functions that can be used by other modules.
• I have added reasonable tests or consciously decided to not add tests.

[rfc2822]

Changing the file names is not enough because they will be created again as soon as we run scripts/fetch-translations.sh (usually before a release).

I think we will have to change [.tx/config]https://github.com/bitfireAT/davx5-ose/blob/main-ose/.tx/config) so that the lang_map is applied to everything but the fastlane files.

I see there's already a comment about that:

davx5-ose/.tx/config

Line 14 in 9754770

# Attention: fastlane directories are like "en-us", not "en-rUS"!

but it's not reflected in the file_filter definitions.

Because [https://developers.transifex.com/docs/using-the-client#language-management-1]:

The "per-resource" mappings take precedence.

Maybe it's enough to add lang_map = to the fastlane resources?