[BUGFIX] Configure extension TemplaVoila results in a fatal error

Due to a lowercase reference to classes the configure window in
the Extension Manager won't be loaded.

Releases: 2.0.0
Change-Id: Ib9d28fc165ab933314e9f0af7e978c653ea6fd19
Reviewed-on: https://review.typo3.org/30993
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters