As an editor I want to find Items missing a Label in a certain language that use a specific Property in order to ensure all important labels are added.
**Problem:**
We currently don't have a constraint that helps ensure certain Items always have a label in a specific language.
Currently editors are solving this with a complex constraint: [[https://www.wikidata.org/wiki/Help:Property_constraints_portal/Label_language | Help:Property_constraints_portal/Label_language]]
**Example:**
* Items using RKDartists ID (P650) should have a Dutch label
**BDD**
GIVEN a Property Y
AND a Constraint definition that requires a Label in language X
WHEN an Item uses Property Y
AND does not have a Label in Language X
THEN a constraint violation is triggered for the statement using Property Y
**Acceptance criteria:**
[ ] constraint violations are triggered when an Item uses a Property with a Label language constraint but does not have a label in the specified language
**Notes:**
* We also want this constraint to work on Property pages. We probably want to ignore it on MediaInfo. We can't apply it on Lexemes, Forms and Senses because they don't have Labels.
* If several languages are provided in the constraint then the constraint is satisfied if at least one of the languages has a label added
**Original report:**
Label in language: An item using a certain property should at least have a label in this language or these languages. example defined on Property talk:P650 (https://www.wikidata.org/wiki/Property_talk:P650).
(part of https://www.wikidata.org/wiki/Help_talk:Property_constraints_portal#Improvements_for_2018 )
Currently implemented as "complex constraint", see [[https://www.wikidata.org/wiki/Help:Property_constraints_portal/Label_language | Help:Property_constraints_portal/Label_language]]