XWIKI-9411: Replace "Workspace" term by "SubWiki".

* Changing the workspace translation keys content for English & French.
XWIKI-9411: Replace "Workspace" term by "SubWiki".

* Minor fix.
XWIKI-9411: Replace "Workspace" term by "SubWiki".

* Changing the workspace translation keys content for English & French.
XWIKI-9411: Replace "Workspace" term by "Wiki".
Merge pull request #146 from gdelhumeau/XWIKI-9411

XWIKI-9411: Replace "Workspace" term by "Wiki"