ci: adapt frontend input variable and path

[rekt-hard]

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Description

Adapt frontend path so packages can specify completely. In invenio-app-rdm, the path is invenio_app_rdm/theme/assets/semantic_ui/translations/invenio_app_rdm, while for most other packages, it is <package_name>/assets/semantic_ui/translations/<package_name (i.e. without theme).

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• [ ] I'm aware of the code of conduct.
• [ ] I've created logical separate commits and followed the commit message format.
• [ ] I've added relevant test cases.
• [ ] I've added relevant documentation.
• [ ] I've marked translation strings (for relevant code).
• [ ] I've followed the CSS/JS and React guidelines (for relevant code).
• [ ] I've followed the web accessibility guidelines (for relevant code).
• [ ] I've followed the user interface guidelines (for relevant code).
• [ ] I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• [ ] I've NOT included third-party code (copy/pasted source code or new dependencies).

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