Log Message:
Update contao35 to 3.5.4.

Version 3.5.4 (2015-10-09)
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### Fixed
Do not add the back end language in the meta wizard (see #8056).

### Fixed
Do not add excluded files to the DBAFS if they are edited in the file manager.

### Fixed
Add the `|flatten` insert tag flag to handle arrays (see #8021).

### Fixed
Check for excluded folders in the back end file popup (see #8003).

### Fixed
Fixed a wrong option name when initializing sortables (see #8053).

### Fixed
Translate UUIDs to paths in the parent view header fields.

### Fixed
Trigger the options_callback for the parent view header fields (see #8031).

### Fixed
Correctly create the initial version of a member without username (see #8037).

### Fixed
Improve the performance of the debug bar (see #7839).

### Fixed
Correctly output the event details in the `event_list` template (see #8041).

### Fixed
Only modify empty `href` attributes in the `nav_` template (see #8006, #8038).

### Fixed
Correctly show the group headlines in the repository DB updater (see #8020).

### Fixed
Improve the e-mail regex to also match the new TLDs (see #7984).

### Fixed
Ensure that the database port is not empty (see #7950).

### Fixed
Remove the left-over usages of `$this->v2warning` (see #8027).

### Fixed
Support the `hasDetails` variable in the event reader (see #8011).