Update translations, adding French.
* src/main/java/org/glom/web/OnlineGlom.gwt.xml:
* src/main/resources/org/glom/web/client/ui/OnlineGlomConstants_fr.properties:
Add a French translation, using the translation from Glom.
* src/main/resources/org/glom/web/client/ui/OnlineGlomConstants_cs.properties:
* src/main/resources/org/glom/web/client/ui/OnlineGlomConstants_es.properties:
* src/main/resources/org/glom/web/client/ui/OnlineGlomConstants_sl.properties:
Update these based on the translations from Glom.