Fixed migration so MySQL GIS test doesn't fail; refs #22001.

The test previously failed with the error:
(1170, "BLOB/TEXT column 'name' used in key specification without a key length")
Fixed #22253 -- Added django-i18n to the mailing lists docs.

Thanks bmispelon for the suggestion.
Replaced reference to ModelAdmin.get_formsets() (deprecated) with get_formsets_with_inlines().