And since I forgot adding it above, posting this standalone for visibility for those wanting to set up their filters manually:
Regex pattern before translatable text (i.e. start):
^t\[\d+] = "
Regex pattern after translatable text (i.e. end; mind the number of whitespaces!):
" --
Regex pattern for translatable text (might be needed, e.g. in memoQ):
.+