Update docs & translations

gui/assets/lang/lang-fy.json

@@ -1,4 +1,5 @@
 {
+    "A device with that ID is already added.": "A device with that ID is already added.",
     "A negative number of days doesn't make sense.": "In negatyf tal dagen soe healwiis wêze.",
     "A new major version may not be compatible with previous versions.": "In nije, wichtige ferzje koe wol ris net te kombinearjen wêze mei foargeande ferzjes.",
     "API Key": "API-kaai",
@@ -151,6 +152,7 @@
     "Shared With": "Dielt mei",
     "Short identifier for the folder. Must be the same on all cluster devices.": "Koart opskrift foar de map. Moat op alle apparaten itselde wêze.",
     "Show ID": "ID sjen litte",
+    "Show QR": "Show QR",
     "Shown instead of Device ID in the cluster status. Will be advertised to other devices as an optional default name.": "Wurd ynstee fan apparaat-ID sjen litten by de bondeltastân. Wurd nei oare apparaten advertearre as in mooglike standertnamme.",
     "Shown instead of Device ID in the cluster status. Will be updated to the name the device advertises if left empty.": "Wurd yn de bondel-tastân sjen litten ynstee fan apparaat-ID. Wannear't leech litten wurd, wurd it fernijt nei de namme die it apparaat útstjoert.",
     "Shutdown": "Ofslute",