add language selector to footer

custom/templates/base/footer_content.tmpl

@@ -39,4 +39,22 @@
 			</div>
 		</div>
 	</div>
+	<div class="ui right links">
+		{{if .ShowFooterBranding}}
+			<a target="_blank" rel="noopener noreferrer" href="https://github.com/go-gitea/gitea"><i class="fa fa-github-square"></i><span class="sr-only">GitHub</span></a>
+		{{end}}
+		<div class="ui language bottom floating slide up dropdown link item">
+			<i class="world icon"></i>
+			<div class="text">{{.LangName}}</div>
+			<div class="menu">
+				{{range .AllLangs}}
+					<a lang="{{.Lang}}" class="item {{if eq $.Lang .Lang}}active selected{{end}}" href="{{if eq $.Lang .Lang}}#{{else}}{{$.Link}}?lang={{.Lang}}{{end}}">{{.Name}}</a>
+				{{end}}
+			</div>
+		</div>
+		{{if .EnableSwagger}}<a href="{{AppSubUrl}}/api/swagger">API</a>{{end}}
+		<a target="_blank" rel="noopener noreferrer" href="https://gitea.io">{{.i18n.Tr "website"}}</a>
+		{{template "custom/extra_links_footer" .}}
+		{{if (or .ShowFooterVersion .PageIsAdmin)}}<span class="version">{{GoVer}}</span>{{end}}
+	</div>
 </footer>