Fix color for template required toast

Follow-up to #1122 (closed)

When clicking "save" on an empty monitoring setup, the toast is still black, not grey. (Also, the English translation was missing and is also fixed in this MR)

This is because I changed the toast color manually in #1122 (closed), which was about a different toast. We (Andreas & I) decided on this case-by-case approach because we usually don't want .present() to have the failure color. If any other toast require this treatment please LMK so I can add it to this MR.