upgrade to manifest V3

- add localizations
- fix permissions

Unfortunately, manifest V3 isn't as explicit compared to manifest V2. That's what I dislike, especially as it gives less power to UBO.

manifest.json

@@ -1,19 +1,29 @@
 {
-   "background": {
-      "scripts": [ "shopAI.js" ]
-   },
-   "browser_action": {
+	"manifest_version": 3,
+	"name": "__MSG_manifest_name__",
+	"description": "__MSG_manifest_description__",
+	"version": "0",
+	
+	"permissions": [ "tabs", "activeTab", "storage"],
+	
+	"action": {
 	  "default_icon": "gui/icons/logo_no_tiny.png",
       "default_popup": "gui/popup.htm"
 	},
-   "description": "Shop wisely with AI!",
+
+	"content_scripts": [
+		{
+			"matches": ["http://*/*", "https://*/*"],
+			"js": ["shopAI.js"]
+		}
+	],
+	
 	"icons": {
 		"1024": "gui/icons/logo.png",
 		"512": "gui/icons/logo_tiny.png"
 	},
-   "manifest_version": 2,
-   "name": "ShopAI",
+	
 	"options_page": "gui/popup.htm",
-   "permissions": [ "tabs", "webRequest", "webRequestBlocking", "*://*/*" ],
-   "version": "1"
+	
+	"default_locale": "en"
 }