Explain tilde in repo editor

cmd/syncthing/gui.go

@@ -211,6 +211,7 @@ func restGetSystem(w http.ResponseWriter) {
 	res["goroutines"] = runtime.NumGoroutine()
 	res["alloc"] = m.Alloc
 	res["sys"] = m.Sys
+	res["tilde"] = expandTilde("~/")
 	if cfg.Options.GlobalAnnEnabled && discoverer != nil {
 		res["extAnnounceOK"] = discoverer.ExtAnnounceOK()
 	}

gui/index.html

@@ -424,7 +424,7 @@
               <label for="repoPath">Repository Path</label>
               <input name="repoPath" placeholder="~/Documents" id="repoPath" class="form-control" type="text" ng-model="currentRepo.Directory" required></input>
               <p class="help-block">
-              <span ng-if="repoEditor.repoPath.$valid || repoEditor.repoPath.$pristine">Path to the repository on the local computer. Will be created if it does not exist.</span>
+              <span ng-if="repoEditor.repoPath.$valid || repoEditor.repoPath.$pristine">Path to the repository on the local computer. Will be created if it does not exist. The tilde character <code>~</code> can be used as a shortcut for <code>{{system.tilde}}</code>.</span>
               <span ng-if="repoEditor.repoPath.$error.required && repoEditor.repoPath.$dirty">The repository path cannot be blank.</span>
               </p>
             </div>