json corrections (#3194)

letter_case  set to upper for perspective-tricolore
 coopermarif description  correction : the font may be scaled down to 50%.

fonts/cooper_marif/font.json

@@ -1,6 +1,6 @@
 {
     "name": "CooperMarif",
-    "description": "CooperMarif is a large and airy font. Lower case letters  are 60mm high and upper case M is 90  mm high. It can be scaled between 60% and  300%",
+    "description": "CooperMarif is a large and airy font. Lower case letters  are 60mm high and upper case M is 90  mm high. It can be scaled between 50% and  300%",
     "keywords": [
         "display",
         "monogram",

fonts/perspective_tricolore_KOR/font.json

@@ -10,7 +10,8 @@
     "leading": 170.0,
     "auto_satin": false,
     "reversible": false,
-    "letter_case": "",
+    "letter_case": "upper",
+    "description": "police ombrée en tartan tricolore, elle peut être agrandie d'environ 250%",
     "default_glyph": "?",
     "size": 36.0,
     "min_scale": 0.8,