Fix some issues with the previous run of 'make updatepot'.
Fix some issues with the previous run of 'make updatepot'.

In particular, there were strings with references to Stetic (the
MonoDevelop GUI designer).

PintaProject/Pinta,PintaProject/Pinta,Fenex/Pinta,PintaProject/Pinta,Fenex/Pinta,Mailaender/Pinta,jakeclawson/Pinta,Mailaender/Pinta,jakeclawson/Pinta