Fixes:
* Sanitize user-provided content in HTML (Fixes#2193)
* Fix encoding of search query in prev/next pages (Fixes#2229)
* Fix some issues introduced with #2196:
- Fix alignment of all <h3> elements (Move the inline style from the parent to the <h3> element)
- Add missing comma on 'dir' HTML attribute (Typo introduced by PR #2196)
Code cleaning:
* Remove unnecessary 'each_sclice' + 'each' double loop in ECR files
* Clean the player's <source> list generation code (in player.ecr)
Related to #1416, it doesn't really fix the real error, but instead mutes the exception message.
Like explained in #1416, this "exception Error" while flushing the client data doesn't harm the client-server connection. However, this exception message continuously spams the logs and makes debugging and error finding really difficult.
Cherry picked from ui overhaul branch with a few modifications:
- channel folder is renamed to channels
- parsing for channel home and featured channels are removed due to
lack of infrastructure from other commits
(cherry picked from commit 44d18b8e147b47ad06a54cc6fd08423d9f39074d)
The behavior was as follow: on Right-To-Left text (e.g Arabic) that is wrapped
(because it's too long to fit on one line), the second row and following rows
may or may not be right aligned (as RTL text should be). Opening the devtools
fixes that alignement, as consistently as closing the devtool breaks it.
This problem seems to arrive only in the following configurations (link nested
in a paragraph, both of which may or may not have the dir= attribute):
* `<p><a href="some_link">RTL_TEXT</a></p>`
* `<p><a href="some_link" dir="auto">RTL_TEXT</a></p>`
* `<p dir="auto"><a href="some_link">RTL_TEXT</a></p>`
with the following CSS:
```
p {
unicode-bidi: plaintext;
text-align: start;
}
```
Changing the HTML to the following configuration (a paragraph with the dir=
attribute, nested in a link) seems to fix it:
`<a href="some_link"><p dir="auto">RTL_TEXT</p></a>`
This will prevent, on large pages, the LTR and RTL text to be
far away, on each side of the page. This could happen on channel
and playlists descriptions, when the page is displayed on a large
screen.
