Fixing getArticleRoute() calls

There is no need to use catslug in Joomla 3.x because:
1. Core content component doesn't use catslug in article URLs;
2. Process link function - **ContentHelperRoute::getArticleRoute** - requires only catid.
`/components/com_content/helpers/route.php`
`public static function getArticleRoute($id, $catid = 0, $language = 0)`

See more #4371 and #5276

After this PR all URLs to the articles must be identical as in content component.
Fixing getArticleRoute() calls

There is no need to use catslug in Joomla 3.x because:
1. Core content component doesn't use catslug in article URLs;
2. Process link function - **ContentHelperRoute::getArticleRoute** - requires only catid.
`/components/com_content/helpers/route.php`
`public static function getArticleRoute($id, $catid = 0, $language = 0)`

See more #4371 and #5276

After this PR all URLs to the articles must be identical as in content component.
The neverending story of index.html

Two more...
Updated script.php
Fix clear button
updatesites
Merge pull request #5473 from losedk/clear

Fix clear button in discover view
Merge pull request #5471 from smz/MoreIndexHTML

The neverending story of index.html
Update README.md

updated few Migration links to the JDocs
Update README.txt

Few migration links updated
Update README.txt

docs links -> https
Merge pull request #5480 from MAT978/patch-11

Update README.txt
Update README.md

docs links -> https
API site serves all traffic via HTTPS
Merge pull request #5479 from MAT978/patch-10

Update README.md
Merge pull request #5481 from mbabker/APIlinks

API site serves all traffic via HTTPS
 en-GB only: correcting Hyphenation (Fixes #5483 )
 Fixes listing of "All" categories (#4937) (Fixes #5469 )
 Update installation/model/languages.php (Fixes #5331 )
Merge pull request #5426 from shur/patch-10

[fix] Fixing getArticleRoute() calls in featured default_links