Update the default URL for both `label` and `description` in the creation summaries for Wikibase items and properties.
Acceptance Criteria:
[] The empty links should by default link to:
- `label` > https://www.wikidata.org/wiki/Help:Label
- `description` > https://www.wikidata.org/wiki/Help:Description
{F35310450}
Based on findings from T312512, we should be able to update the i18n values directly in Wikibase since the relevant keys are overwritten by Wikidata anyway:
- `wikibase-newitem-summary`: https://www.wikidata.org/wiki/MediaWiki:Wikibase-newitem-summary
- `wikibase-newproperty-summary`: https://www.wikidata.org/wiki/MediaWiki:Wikibase-newproperty-summary
Approach:
[] Update copy in [wikibase/repo/i18n/en.json](https://github.com/wikimedia/mediawiki-extensions-Wikibase/blob/master/repo/i18n/en.json)
[] Wait for translations to propagate
[] Backport changes for Wikibase Cloud