fix(InternalTab): Fix for urls with trailing slash and no locale

[tvdeyen]

What is this pull request for?

The former regexp was ignoring the second slash in urls without locale but with trailing slash, since it was not part of the locale group and optional. Using a non match group for the optional locale and it's optional slash.

Checklist

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message
• [x] I have added tests to cover this change

[codecov[bot]]

Codecov Report

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

Project coverage is 95.96%. Comparing base (7fec21c) to head (8ce686e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2897 +/- ## ======================================= Coverage 95.96% 95.96% ======================================= Files 230 230 Lines 6269 6269 ======================================= Hits 6016 6016 Misses 253 253 ```

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