Refine playground preset terminology

[1ec5]

A couple improvements to playground presets:

• Renamed the “Springy Rocker” preset to “Spring Rider” and added “spring rocker” as a synonym. Both “spring rider” and “spring rocker” appear to be more common than “springy rocker” in usage online.
• Added “merry-go-round” as a synonym for “Play Roundabout”.

[bhousel]

@1ec5 , you updated the generated dist/locales/en.json file - can you instead update the source .json files:

• data/presets/presets/playground/rocker.json
• data/presets/presets/playground/roundabout.json

then npm run build (this will overwrite en.json)

[1ec5]

Thanks, I updated those two JSON files. Running npm run-script build produced tons of changes, enough to crash FileMerge. 😬 So I only added the relevant changes to en.json.

[bhousel]

Thanks @1ec5!