Updated Czech translation
Updated Czech translation
medialibrary: Add a debug statement for storemodel row flushing
medialibrary: Automatically generate missing thumbnails

Completes the solution for bug #432661
medialibrary: Generate thumbnails in the background
Updated Czech translation
Updated German translation
startupwizard: Don't redefine builtin filter
startupwizard: Prefix unused arguments.
startupwizard: Add module docstring
startupwizard: Add docstrings to public and "protected" methods.
startupwizard: Make static methods from methods with no self use.
clipmediaprops: Add comma after space
clipmediaprops: properly UpperCase class name.
clipmediaprops: Add docstrings.
clipmediaprops: Set instance attributes in __init__
clipmediaprops: Switch to new-class style.
depsmanager: Add or break docstrings.
depsmanager: break comments and changes string statement to comments.
filelisterrordialog: Make _addFileExpander a private static method.