refactor locale and fix ci

[goatshriek]

Refactors the locale github actions workflow to use a matrix strategy, making it much shorter.

This also includes a fix to an incorrect use of the -C argument to ctest, which started failing in some environments.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.85%. Comparing base (8d1f007) to head (e963445).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## latest #433 +/- ## ======================================= Coverage 90.85% 90.85% ======================================= Files 47 47 Lines 4384 4384 Branches 586 586 ======================================= Hits 3983 3983 Misses 269 269 Partials 132 132 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud