en to de_CH translation catalogue (3 entries)

[ctx: Title of the CKEditor5 editor.]
en: Rich Text Editor
de_CH: Rich-Text-Edito

[ctx: The label of the top-level application menu bar menu containing buttons and features related to general editing (e.g. undo, redo, select all, etc.).]
en: MENU_BAR_MENU_EDIT
de_CH: Bearbeiten

[ctx: The label of the top-level application menu bar menu containing buttons and features that insert content (e.g. insert table, insert image, etc.).]
en: MENU_BAR_MENU_INSERT
de_CH: Einfügen
