do not include *.po* and duplicate images in build

gulpfile.js

@@ -66,19 +66,20 @@ const paths = {
     ],
   },
   dist: [
-    "i18n/*.po",
-    "i18n/*.pot",
-    "img/*",
-    "style/*.css",
-    "lib/vendor/*",
+    "img/icon.png",
+    "img/logo.png",
     "i18n/strings.js",
     "lib/emscripten/taler-emscripten-lib.js",
     "lib/module-trampoline.js",
+    "lib/vendor/*.js",
+    "style/*.css",
     "popup/**/*.{html,css}",
     "pages/**/*.{html,css}",
     "background/*.html",
   ],
   extra: [
+      "i18n/*.po",
+      "i18n/*.pot",
       "lib/**/*.d.ts",
       "AUTHORS",
       "README",