added iso support

Conflicts:
	redaxo/include/addons/image_manager
	redaxo/include/addons/textile/config.inc.php
updated textile to 2.5.1

Conflicts:
	redaxo/include/addons/image_manager
	redaxo/include/addons/textile/vendor
add lang directory to $I18N

Conflicts:
	redaxo/include/addons/image_manager
	redaxo/include/addons/textile/install.inc.php
Merge branch 'refs/heads/textile_update_to_2.5'

Conflicts:
	.gitmodules
	redaxo/include/addons/image_manager
angepasst

Conflicts:
	redaxo/include/addons/image_manager
loaded angepasst

Conflicts:
	redaxo/include/addons/image_manager
fix textile submodule
checkout rev 2.5.1 in textile submodule