Eeeeh... Well, with photoshoping I did meant: that I do use GIMP as well...
Anyway. Well, it shouldn't be heavy it to do the both: 1st; selected gray or yellow places with a white layer to cover (as well the text bubles), 2nd; with the text application of GIMP the covered text bubles the proper translated texts overwrite, 3rd; save then the work - then are you done with.