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OpenStackManager is an extension to run a cluster of virtual servers, as on Wikimedia Labs, which you can use to run your MediaWiki test wiki. Register on translatewiki.net, clone the extension and edit en.json/qqq.json/PHP files as needed to address:

• https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Openstackmanager-failedeletedomainduplicates/es
• https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Openstackmanager-hiera-noadmin/en

You probably only need to edit qqq.json to add more context for translators; install the extension on your own virtual machine or explore wikitech.wikimedia.org to discover what those messages mean.

See https://www.mediawiki.org/wiki/Manual:Messages_API and https://www.mediawiki.org/wiki/i18n for the manuals on how to work with system messages.