Drupal 7 uses LANGUAGE_NONE (und) which is renamed to LANGUAGE_NOT_SPECIFIED in #965300: Change LANGUAGE_NONE to LANGUAGE_NOT_SPECIFIED; add LANGUAGE_NOT_APPLICABLE and LANGUAGE_MULTIPLE to better explain what it is. Now LANGUAGE_NONE was used for various roles in Drupal 7 including at places where we did not know language (proper use) to where we knew it did not have language (where LANGUAGE_NOT_APPLICABLE should be used now) including where we just said it applies to all languages (for paths for example).

We should review and update the use of 'und' now that we have more language variants so we can better say what is the situation in each case. This can IMHO be done in parallel with #1471432: Rework language_list(), let people use more special languages but is postponed on #965300: Change LANGUAGE_NONE to LANGUAGE_NOT_SPECIFIED; add LANGUAGE_NOT_APPLICABLE and LANGUAGE_MULTIPLE needing to land.

The Drupal 7 usage of LANGUAGE_NONE (for entities) is explained in the Language support for entity fields documentation.

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gábor hojtsy’s picture

gábor hojtsy
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Primary language Hungarian
Location Hungary
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Issue tags: +D8MI, +sprint, +language-base

Adding tags.

gábor hojtsy’s picture

gábor hojtsy
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Primary language Hungarian
Location Hungary
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Status: Postponed » Active

#965300: Change LANGUAGE_NONE to LANGUAGE_NOT_SPECIFIED; add LANGUAGE_NOT_APPLICABLE and LANGUAGE_MULTIPLE landed, so here we go.

kristen pol’s picture

kristen pol
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Location Santa Cruz, CA, USA
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Issue summary: View changes

Updated issue summary.

gábor hojtsy’s picture

gábor hojtsy
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Primary language Hungarian
Location Hungary
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Issue tags: -sprint

Not actually being worked on.

yesct’s picture

yesct commented

related: #1869292: Remove confusing "multiple" language from core

yesct’s picture

yesct commented
Issue summary: View changes

Updated issue summary.

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penyaskito’s picture

penyaskito
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Location 🧑🏽‍🌾 Seville 💃 Andalusia, UTC+2 🇪🇺
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Issue summary: View changes
Status: Active » Closed (outdated)

\Drupal\Core\Language\LanguageInterface contains those constants and when to use each of those is documented.