fix issues on action runners page (#27226) (#27233)

Backport #27226 by @denyskon

- switch from some weird status badge to label
- translate untranslated `Reset registration token` string
- change documentation link from act_runner README to Gitea Docs site
- fix "No runners available" message width
- use `ctx.Locale.Tr` where possible


![grafik](https://github.com/go-gitea/gitea/assets/47871822/65547228-f9ed-4f80-9cfd-df5e55513a44)

Co-authored-by: Denys Konovalov <kontakt@denyskon.de>

templates/shared/actions/runner_edit.tmpl

@@ -9,7 +9,7 @@
 			<div class="runner-basic-info">
 				<div class="field gt-dib gt-mr-4">
 					<label>{{.locale.Tr "actions.runners.status"}}</label>
-					<span class="runner-status-{{if .Runner.IsOnline}}online{{else}}offline{{end}}">{{.Runner.StatusLocaleName $.locale}}</span>
+					<span class="ui {{if .Runner.IsOnline}}green{{else}}basic{{end}} label">{{.Runner.StatusLocaleName $.locale}}</span>
 				</div>
 				<div class="field gt-dib gt-mr-4">
 					<label>{{.locale.Tr "actions.runners.last_online"}}</label>