[automatic translation update] Updated 131 strings in 37 languages (be, bg, bs, ca, cs, da, de, el, es, fa, fi, fr, hi, hr, hu, id, it, ja, ko, lv, nb, nl, nn, pl, pt-br, pt, ro, ru, sk, sl, sq, sr, sv, th, tl, vi, zh-cn)

Segment editor ui tests

Do not use less functions in gradient mixins to avoid lessphp failures when the color values are not actual color values

Do not use less functions in gradient mixins to avoid lessc failures when the color values are not actual color values (eg, they could be placeholders).

 Add "Download file URL" and "Outlink URL" segments

 + tests

Add new Custom Segments: outlinkURL and downloadUrl to segment on any Clicked URL or Downloaded file

Segment subquery cache: minor code review items

https://github.com/piwik/piwik/issues/8850

Conflicts:
	plugins/Live/stylesheets/live.less

Fix some icon placement issues