Remove unused translations from original image source

[YorVeX]

The translations for the async image source were copied 1:1 from the original, since also the settings they are used for are the same.
But since the original image source is combined with the color source and image slide show also all translations from these are currently included. A small script needs to be written to go through all of these .ini files and remove the items that are not used by this source.