Fix typo in "Opacity" (#489)

public/locales/en/translation.json

@@ -15,7 +15,7 @@
     "fill": "Fill",
     "strokeWidth": "Stroke Width",
     "sloppiness": "Sloppiness",
-    "oppacity": "Oppacity",
+    "opacity": "Opacity",
     "fontSize": "Font Size",
     "fontFamily": "Font Family",
     "onlySelected": "Only selected",

src/actions/actionProperties.tsx

@@ -199,7 +199,7 @@ export const actionChangeOpacity: Action = {
   },
   PanelComponent: ({ elements, appState, updateData, t }) => (
     <>
-      <h5>{t("labels.oppacity")}</h5>
+      <h5>{t("labels.opacity")}</h5>
       <input
         type="range"
         min="0"