[MDL-50186] Javascript validation broke when element has id with special chars - Moodle Tracker

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Testing Instructions:
1. Add a new page module
2. fill the name and leave other fields blank
3. make sure that when you submit the form the "content" field with error gets focus without reloading the page
Affected Branches:
MOODLE_27_STABLE, MOODLE_28_STABLE, MOODLE_29_STABLE
Fixed Branches:
MOODLE_28_STABLE, MOODLE_29_STABLE
Pull from Repository:
git://github.com/mastnym/moodle.git
Pull Master Branch:
~~MDL-50186~~-master
Pull Master Diff URL:
https://github.com/mastnym/moodle/compare/803f5657...MDL-50186-master

When there's a special character in id attribute of an element, the Y.one method fails to find it without escaping.

Discovered while testing

MDL-31016 Form validation does not focus on HTML Editors

is a regression caused by

MDL-49783 Form does not get focus when error field is in collapsed section