datapackFailure.title currently reads:

Errors in currently selected datapacks prevented world from loading.
You can either try to load only with vanilla datapack ("safe mode") or go back to title screen and fix it manually.

and should read something like:

Errors in currently selected data packs prevented the world from loading.
You can either try to load it with only the vanilla data pack ("safe mode"), or go back to the title screen and fix it manually.

Note the comma after the parentheses, the spaces between "data" and "packs" (for consistency with other strings) and the missing "the"s. Also moved the word "only" for flow.