When translating templates, they can be selected and get highlighted in blue to communicate their status.

In the current implementation, the highlight happens behind the template which does not convey the idea of the whole template being highlighted.

If creating an overlay is technically complex, another way to support the same effect would be to make the contents of the template to have some transparency when the template container is selected. In the example below, a 70% opacity has been used:

(Tested in the testing server for a Spanish to Catalan translation of Tokyo)