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exit search screen with Esc key (#2055)

* exit search with esc key feature is added
* closing search screen with esc key feature is added to _main.js

Fix bad YAML

Remove comma

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Updated swedish translations. (#2056)

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update Font Awesome (#2053)

* update Font Awesome

REF: https://fontawesome.com/changelog/latest

* Update _includes/scripts.html

Co-Authored-By: coliff <christianoliff@yahoo.com>

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Compile main.min.js

[fix] syntax error of non-english character (#2042)

* Dear the make of one of the world's greatest jekyll theme.

[problem]
I found that
'Syntax Error' occurs when non-english character is included in some html elements(e.g h2, h3 ...) and 'toc' is generated based of that elements.

[debug]
Click the any element of auto generated 'toc' in the below link.
https://aliwo.github.io/swblog/series/principles_of_python/object/#%EA%B0%9D%EC%B2%B4%EC%99%80-%ED%81%B4%EB%9E%98%EC%8A%A4%EC%9D%98-%EC%A0%95%EC%9D%98

[fix]
This happens because escaped url string get right in to jquery. So I fixed it with
javascript's 'decodeURI' function! :)

* rollback unnecessary changes

Remove 'www' from Stack Overflow URL (#2054)

Stack Overflow is no longer including `www` in its URLs.

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Update ui-text.yml (#2037)

Add Malayalam localized UI text strings

Fix `site.logo` false positives

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Add empty `alt` attribute to img tag with logo (#2035)

* Provide empty alt attribute (alt="") for logo image, because it does not provide information

Fix empty `<img>` when `site_logo` is not assigned

Ref: https://github.com/mmistakes/minimal-mistakes/pull/2026#issuecomment-454809876

Release 4.15.0 💎

Add logo and title customization to the masthead (#2026)

* Add logo and title customization to the masthead

* Adjust config description

* Add test site logo to `/test`

* Document `site.logo` and `site.masthead_title`

* Update CHANGELOG and history

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