Use shorthands for lang entries in Image2 dialog.
Removed comments from en lang file.
Merge branch 't/11068' into major
Removed beta markers from samples index.
Removed ckeditor-sample-isbeta meta from Image2 and Mathjax samples.
Merge branch 't/11080' into major
Normalize styles because IE8 use uppercased properties.
Trim whitespaces, so data processor is not creating data-cke-markers breaking 'single widget pasted' check.
Strip expandos in data processor's data filter.
Inputs are marked with contenteditable=false flags, so filters for them need to be applied to non-editable content as well.