Invalid argument for foreach fixed

Cf. https://github.com/ldleman/Leed/issues/305#issuecomment-34576716
Useless parentheses in Plugin.class.php removed
Correction orthographique dans fr.json
New spanish translation
Merge branch 'dev' of https://github.com/ldleman/Leed into dev
Updated es.json because of merge
Relecture
Merge pull request #316 from Phyks/dev

Traduction espagnole