#52232 - Remove useless <strong> tags in labels displayed in plugin/theme editor screens

[chemiker]

Removes <strong> tags as suggested in #52232. It must be mentioned that the font-weight of the labels "Documentation" and "Select plugin to edit:" remain bold due to their CSS styling.

Trac ticket: https://core.trac.wordpress.org/ticket/52232

[github-actions]

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[chemiker]

Merged with 72ad4e1