Match naming convention on page (checkbox→chk)

templates/user/auth/signin.tmpl

@@ -17,7 +17,7 @@
             </div>
             {{if not .IsSocialLogin}}
             <div class="field">
-                <label class="checkbox-label">
+                <label class="chk-label">
                     <input class="ipt-chk" id="remember" name="remember" type="checkbox"/>&nbsp;&nbsp;&nbsp;&nbsp;<strong>{{.i18n.Tr "auth.remember_me"}}</strong>
                 </label>
             </div>