Update Russian language (octobercms#5540)

Rollback octobercms#4908

Merge branch 'develop' into 1.1

Make popup textarea HTML5-compliant in Inspector editor.

Previously, this was a self-closing tag with a value attribute. Neither are supported for the textarea tag in HTML5. It appears that browsers now are actually checking this and/or won't work with it.

Fixes octobercms#5222.

Document Select2's dynamic option creation (octobercms#5052)