Merge pull request #13 from tqhien/manual_en_v1.8

FR : Translation of 4 plugins
Merge pull request #14 from tqhien/manual_en_v1.8

FR : Translation of 3 last plugins (Heatmap, Diagram Overlay and georef)
fr: raster calculator translated
fr: OGC index translated
fr: OGC client translation started