Merge branch 'caption-centered' into 'develop'

Updating caption background corners to be rounder

See merge request !10

src/data/caption.json

@@ -66,7 +66,7 @@
       {
         "co": {
           "X": 1,
-          "Y": 10
+          "Y": 20
         },
         "handle_type": 0,
         "interpolation": 0