I don’t think any of them being too long. In the German translation “Breaks && Spacer” is the same length as “Articulations & Ornaments”
Just “Frames” is not good enough IMHO, when it also has an entry for adding measures, this would be misleading.
Could use a + instead of the & or /, without the spaces around, would even save 2 chars, but I think & looks nicer

Whatever we do, Palette and Master Palette should use the same entries.