fix(strings): differentiate setup(n) and set(v) up (#10024)

Correct GUI strings, translations and comments to use proper grammar.

cmd/infra/strelaypoolsrv/README.md

@@ -10,7 +10,7 @@ to NAT or firewall issues.
 
 There is very little reason why you'd want to run this yourself, as
 `relaypoolsrv` is just used for announcement and lookup of public relay
-servers. If you are looking to setup a private or a public relay, please
+servers. If you are looking to set up a private or a public relay, please
 check the documentation for
 [relaysrv](https://github.com/syncthing/relaysrv), which also explains how
 to join the default public pool.

cmd/syncthing/monitor.go

@@ -64,7 +64,7 @@ func monitorMain(options serveOptions) {
 			fileDst, err = open(logFile)
 		}
 		if err != nil {
-			l.Warnln("Failed to setup logging to file, proceeding with logging to stdout only:", err)
+			l.Warnln("Failed to set up logging to file, proceeding with logging to stdout only:", err)
 		} else {
 			if build.IsWindows {
 				// Translate line breaks to Windows standard