refactor: Update globe button to modify lang in URL paths 🌋

[darcywong00]

Part of #696

Since i18n redirects /file to <lang>/file, this updates the globe key button to modify the BCP-47 language tag in the URL. The initial implementation of the globe key set the language tag as a query parameter.

Additional changes:

• Replaces en in .htaccess with a basic regex to allow language-script-region BCP-47 triplets. To keep things simple, intentionally not using the full-blown regex in

  keyman.com/_includes/2020/Validation.php

  Lines 28 to 37 in b448efc

  	public static function validate_bcp47($bcp47, $default = null) {
  	if($bcp47 === null) return $default;
  	$bcp47 = trim(strtolower($bcp47));
  	// RegEx from https://stackoverflow.com/questions/7035825/regular-expression-for-a-language-tag-as-defined-by-bcp47, https://stackoverflow.com/a/34775980/1836776
  	if(preg_match("/^(?<grandfathered>(?:en-GB-oed|i-(?:ami|bnn|default|enochian|hak|klingon|lux|mingo|navajo|pwn|t(?:a[oy]|su))|sgn-(?:BE-(?:FR|NL)|CH-DE))|(?:art-lojban|cel-gaulish|no-(?:bok|nyn)|zh-(?:guoyu|hakka|min(?:-nan)?|xiang)))|(?:(?<language>(?:[A-Za-z]{2,3}(?:-(?<extlang>[A-Za-z]{3}(?:-[A-Za-z]{3}){0,2}))?)|[A-Za-z]{4}|[A-Za-z]{5,8})(?:-(?<script>[A-Za-z]{4}))?(?:-(?<region>[A-Za-z]{2}|[0-9]{3}))?(?:-(?<variant>[A-Za-z0-9]{5,8}|[0-9][A-Za-z0-9]{3}))*(?:-(?<extension>[0-9A-WY-Za-wy-z](?:-[A-Za-z0-9]{2,8})+))*)(?:-(?<privateUse>x(?:-[A-Za-z0-9]{1,8})+))?$/Di",
  	$bcp47)) {
  	return $bcp47;
  	}
  	return $default;
  	}

• Globe key changes:
  • Update to always be visible (previously implemented to only appear on pages that contained localization)
  • Change phone menu list description from "Keyboard Search UI" to "Display in:"
  • Add (Khmer) to language name

Screenshots

phone layout

desktop layout

Test-bot: skip

[keymanapp-test-bot]

User Test Results

Test specification and instructions

User tests are not required

[darcywong00]

The 404.php was throwing uncaught error of \Keyman\Site\com\keyman\Validation class not being defined 😕

[mcdurdin]

Excluding all locales except en will not scale well. I wonder if there is a better way -- can we build a scripted filter using the api published at broken-link-checker?

[mcdurdin]

Can this be extracted to a different file?

[darcywong00]

refactored the list of language names to Locale.php in e9e548d