MDL-42711 import learnmoodle fixes: Fix the broken links in RSS feed block

If the <description> of the feed contains URLs longer than 30 characters, the
URL is split because of the break_up_long_words(). When combined with the
filter that converts URLs to links, this produces broken links.

The proper solution would be to improve break_up_long_words() so that it does
not modifies URLs at all. As a temporary solution for our purpose now is to
call format_text() prior to break_up_long_words() as it will not modify the
inner content of the <a> tag.

This should be fixed upstream. See also discussion at
https://moodle.org/mod/forum/discuss.php?d=34947
MDLSITE-2455 Do not throw coding exception when the activity is not found

Under certain conditions, coding exception is thrown when fetching items from
the navigation bar. The patch prevents them. See more details in the tracker.
MDLSITE-2493 glossary filter alert dialog button string now translatable

Conflicts:
	filter/glossary/yui/build/moodle-filter_glossary-autolinker/moodle-filter_glossary-autolinker-debug.js
	filter/glossary/yui/build/moodle-filter_glossary-autolinker/moodle-filter_glossary-autolinker-min.js
	filter/glossary/yui/build/moodle-filter_glossary-autolinker/moodle-filter_glossary-autolinker.js
	filter/glossary/yui/src/autolinker/js/autolinker.js -- M.core.alert api was changed.