Add localized text string

Fixes aria issues on search form (#2211)

* Fixes aria issues on search form
* Swapping aria-label for <label> tag in search
* Removing background gray caused by adding <form> tag to search
* Removing redundant space
* Making form not submit if key is enter

Close #2180

Complete missing parts of Korean locale. (#2209)

search_placeholder_text, results_found, and back_to_top

Add skip links

Close #2182

Fix and improve pt-BR localization. (#2162)

Fix and complete Spanish localization (#2149)

Add UI Text for Thai Language (#2111)

Added missing Hindi Translation of ui-text (#2105)

Due to unknown reason, Hindi translation of ui-text was missing (https://github.com/mmistakes/minimal-mistakes/issues/2101)
I have added it back from a previous pull request (https://github.com/mmistakes/minimal-mistakes/pull/1888)

Typos fix and including more words for pt-br (#2098)

I just fixed some typos PT-BR, included translations for words that were not translated and changed some words to better describe the tag's meaning. This is how I use it in my Portuguese blog.

Updated vi-VN for some missing terms (#2097)

```yml
search_placeholder_text    : "Nhập từ khóa cần tìm..."
results_found              : "Kết quả tìm được"
back_to_top                : "Về đầu trang"
```

Fix French translation typo (#2096)

Add missing translation of chinese (#2072)

Add missing Chinese text strings

Fix bad YAML

Remove comma

Updated swedish translations. (#2056)

Update ui-text.yml (#2037)

Add Malayalam localized UI text strings

Accessibility: Add aria-label to the search button (#2014)

* Accessibility: Add aria-label to the search button
* Update button aria text
* Add aria text to menu toggle
* Add span for search toggle
* Update span for menu label & remove aria
* Update ui-text.yml to add search_label

Persian Translation of UI Elements (#2004)

* Add Persian translation to ui-text.yml
* Mention the added Persian translation in the documentation

[Bug fix]: Added missing Staticman Spanish UI text (#1997)

Taken from line 91 of 5d-eu/messages.php@ec56008

Punjabi Translation of ui-text (#1962)

* Punjabi Translation of ui-text

There are more than 100 million native speakers of Punjabi language. I am one of them. More details about [punjabi on wikipedia](https://en.wikipedia.org/wiki/Punjabi_language).
All the punjabi translations are perfect with the following exceptions-
  - in the variable name (_config.yml and words_per_minute) which are intentionally left in english.
  - meta_label is empty

Hindi Translation of ui-text #1887 (#1888)

* Hindi Translation of ui-text #1887
* Update README.md and about.md