web/i18n: move call to action button strings to own file

web/i18n/en/a11y/dialog.json

@@ -1,7 +1,5 @@
 {
     "picker.item.photo": "photo thumbnail",
     "picker.item.video": "video thumbnail",
-    "picker.item.gif": "gif thumbnail",
-
-    "saving.copied": "link copied"
+    "picker.item.gif": "gif thumbnail"
 }

web/i18n/en/button.json

@@ -0,0 +1,15 @@
+{
+    "gotit": "got it",
+    "cancel": "cancel",
+    "reset": "reset",
+    "done": "done",
+    "downloadAudio": "download audio",
+    "download": "download",
+    "share": "share",
+    "copy": "copy",
+    "copied": "copied",
+    "import": "import",
+    "continue": "continue",
+    "star": "star",
+    "follow": "follow"
+}

web/i18n/en/dialog.json

@@ -1,15 +1,4 @@
 {
-    "button.gotit": "got it",
-    "button.cancel": "cancel",
-    "button.reset": "reset",
-    "button.done": "done",
-    "button.downloadAudio": "download audio",
-    "button.download": "download",
-    "button.share": "share",
-    "button.copy": "copy",
-    "button.import": "import",
-    "button.continue": "continue",
-
     "reset.title": "reset all settings?",
     "reset.body": "are you sure you want to reset all settings? this action is immediate and irreversible.",