@Lea Lacroix (WMDE): I'm not sure how it is handled so I comment it here. Text from MediaWiki:Wikibase-client-data-bridge-unsupported-datatype-error-body, in English "$1 is of the datatype $2 on {{WBREPONAME}}. Editing this datatype is currently not supported." I'm not sure if $2, the datatype, is localized in any language. In Catalan we don't expect it translated so it reads, i.e. "data de naixement és una dada de tipus time a Wikidata". My first thought was to add italics to $2 but probably it should be handled in the original message, or in the information about the message if it is not needed in English.
Also, label $1 is usually in lowercase and it is used at the begining of the sentence. To avoid that, it could be "On {{WBREPONAME}}, $1 is of the datatype $2". Again, I'm not sure to change it only in Catalan.