Bug #79348

Localization in TyposcriptFrontendController only allows defined Backend-Languages in TYPO3\CMS\Core\Localization\Locales

Added by Tobias Eichelberger almost 4 years ago. Updated 12 months ago.

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Hi there,

we need two additional languages for our projects:
- cn
- tw

We wondered, why it is not possible to get the linked xlf-files
- /MyExtension/Resources/Private/Language/cn.locallang.xlf
- /MyExtension/Resources/Private/Language/tw.locallang.xlf

working, and found the reason in TyposcriptFrontendController->initLLvars:

In this method, TYPO3 decides wether $this->languageDependencies is written or not:

  // Language is found. Configure it:
  if (in_array($this->lang, $locales->getLocales())) { // this fails, due to getLocales!
      $this->languageDependencies[] = $this->lang;

$locales->getLocales() comes from TYPO3\CMS\Core\Localization\Locales, in which you can read: "Defining backend system languages".

After that process TyposcriptFrontendController->readLLfile only loads locallang files, with a prefix from languageDependencies.

The problem now is:
If we need a language, which is not supported by TYPO3 backend/locales, we fail, even though it would be no problem to load and use the language with any other (wrong) prefix.

So my request/question is, to simply change the TyposcriptFrontendController->initLLvars as follows:

  // Language is found. Configure it:
  if (in_array($this->lang, $locales->getLocales()) || TYPO3_MODE === "FE") { //underline TYPO3_MODE == FE ;)
      $this->languageDependencies[] = $this->lang;

This would allow to use any iso2-language prefix in frontend.

Do you guys see any problems with that?

Best regards,


Updated by Susanne Moog almost 3 years ago

  • Category set to Localization

Updated by Georg Ringer about 1 year ago

  • Tags set to Xlf

Updated by Marc Bastian Heinrichs 12 months ago

Do you guys see any problems with that?

Jep, TYPO3_MODE or TYPO3_REQUESTTYPE (since v9) does not help here, because you can have a TyposcriptFrontendController "booted" also in an request started in BE or CLI.

Also you need support for country specific languages, like de_CH and fr_CH, where the languageDependencies de and fr will be missing for fallback.


Updated by Marc Bastian Heinrichs 12 months ago

There is an configuration option
to add custom languages, which could be used to solve both needs here.
You will see this languages in the language module in backend, but it does not really hurt IMO.

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