Update default Python to 3.14

[vkbo]

Summary:

• Changes default Python for testing and embedding in builds to 3.14
• Fixes the i18n workflow to trigger on translation file changes

Related Issue(s):

Reviewer's Checklist:

• The header of all files contain a reference to the repository license
• The overall test coverage is increased or remains the same as before
• All tests are passing
• All linting checks are passing and the style guide is followed
• Documentation (as docstrings) is complete and understandable
• Only files that have been actively changed are committed