Log Message:
Update contao33 to 3.3.4.  Latvian language files are added.

Version 3.3.4 (2014-07-29)
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### Fixed
Restore permission to delete root pages for admin users (see #7135).

### Fixed
Pass the file IDs instead of their UUIDs to the file picker (see #7139).

### Fixed
Correctly handle double quotes in comments (see #7102).

### Fixed
Ignore hidden files when building the internal cache (see #7098).

### Fixed
Correctly pass the insert ID of the undo record (see #6234).

### Fixed
Update the vendor libraries (fixes various issues).