Various wording issues in strings.xml

[boothy060590]

Couple of issue's with English strings displayed in UI either containing spelling mistakes or requiring slight rewording.

E.g. "The connected node ist not fully synced yet" needs to replace "ist" with "is" etc.

See src/main/res/values/strings.xml for list of string placeholder keys and values that may need rewording or correcting

[jjhesk]

hi i got the translation sheet @boothy060590 is the possible to help checking it?

[pinpong]

Feel free to provide a PR.