[BUGFIX:BP:11.2] use siteLanguage TypoScript object to get language id #3555
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Backport of #3522
"TSFE:sys_language_uid" not working anymore
What this pr does
Replace outdated/removed TypoScript.
How to test
Opensearch URLs are generated with empty L-queryparam in at least TYPO3 v11 (probably even in v10).
&L=
Fixes: #3521