Set preview text same for viewing all selected fonts

#This issue also works for requesting features.

**Describe the issue**
[How] can I set the preview text's Language, Text, and Size (by slider and/or numeric input) for the list of all my collected (Selected) potential Google Fonts ( fonts.google.com/selection ) for side-by-side comparison of key characters/words? The samples currently don't all show the same language or even Writing System for the site default quote, though I know they DO all include nice English (Latin) characters, making comparison impossible!

I don't know whether this function exists already, and I just can't find it (in which case, please make the input option more explicit and obvious!), or if this is a new-feature request. I really don't want to have to download and install a whole bunch of Maybes, and make my own side-by-side test doc, when it seems such an obvious function for the Selections view to offer.

**Screenshot**