Kwave I18N fix on the file properties UI

Summary:
I18N translation is not working for contextual help (popup & question mark helper) on the following screens under file properties:
- Compression tab on the compression parameters,
- Miscellaneous tab on the keywords management.

Test Plan:
- Validate if this patch is not having any side effect elsewhere and it is appropriate.
- Check if the English UI still fine.
- Check with another language, where the translation is completed e.g French, if the text is displayed correctly.

Reviewers: the

Reviewed By: the

Subscribers: ltoscano

Differential Revision: https://phabricator.kde.org/D7867