Change RawTherapee strings to ART in language file

[Sebastien Guyader]

Here’s a diff file to change several occurrences of “RawTherapee” to “ART” in the default language file.

[agriggio]

change RawTherapee --> ART in the default language file

Thanks to Sebastien Guyader Fixes #12

→ <<cset c29b4298a2d3>>