update update channels

config.js

@@ -46,12 +46,15 @@ var config = {
   title: 'Firmware',
   // branch descriptions shown during selection
   branch_descriptions: {
-    nightly: 'Ungetestet, automatisch generiert.'
+    stable: 'Empfohlen.',
+    beta: 'Hilf den Firmware-Entwicklern mit Tests. Kann gelegentlich Probleme machen.',
+    nightly: 'Ungetestet, automatisch generiert.',
+    experimental: 'Halte den Lötkolben bereit.'
   },
   // recommended branch will be marked during selection
-  recommended_branch: 'nightly',
+  recommended_branch: 'stable',
   // experimental branches (show a warning for these branches)
-  experimental_branches: ['beta', 'nightly'],
+  experimental_branches: ['experimental', 'nightly'],
   // path to preview pictures directory
   preview_pictures: 'pictures/',
   // link to changelog