Make `IHasTooltip` interface use a `LocalisedString` instead of a regular string.
Make `IHasTooltip` interface use a `LocalisedString` instead of a regular string.

smoogipooo/osu-framework,peppy/osu-framework,ZLima12/osu-framework,ppy/osu-framework,peppy/osu-framework,peppy/osu-framework,ppy/osu-framework,smoogipooo/osu-framework,ppy/osu-framework,ZLima12/osu-framework