Add a shortcut to delete TM entries (Ctrl+Alt+Number)

Summary:
Add a shortcut to delete TM entries (Ctrl+Alt+Number)

FEATURE: 233144

Reviewers: aacid, ltoscano, shaforostoff, mlaurent, #localization

Reviewed By: aacid, #localization

Tags: #localization

Differential Revision: https://phabricator.kde.org/D14573