content: Use LabelWithWidgets to display inviter

data/resources/ui/content-invite.ui

@@ -80,10 +80,10 @@
                       </object>
                     </child>
                     <child>
-                      <object class="GtkBox">
-                        <property name="halign">center</property>
+                      <object class="LabelWithWidgets">
+                        <property name="label" translatable="yes">&lt;widget&gt; invited you</property>
                         <child>
-                          <object class="Pill" id="inviter">
+                          <object class="Pill">
                             <binding name="user">
                               <lookup name="inviter">
                                 <lookup name="room">ContentInvite</lookup>
@@ -91,12 +91,6 @@
                             </binding>
                           </object>
                         </child>
-                        <child>
-                          <object class="GtkLabel">
-                            <!-- Translators: the space at the beginning is there on purpose -->
-                            <property name="label" translatable="yes"> invited you</property>
-                          </object>
-                        </child>
                       </object>
                     </child>
                     <child>

src/session/content/invite.rs

@@ -1,5 +1,5 @@
 use crate::{
-    components::{Pill, SpinnerButton},
+    components::{LabelWithWidgets, Pill, SpinnerButton},
     session::{categories::CategoryType, room::Room},
 };
 use adw::subclass::prelude::*;
@@ -23,8 +23,6 @@ mod imp {
         #[template_child]
         pub headerbar: TemplateChild<adw::HeaderBar>,
         #[template_child]
-        pub inviter: TemplateChild<adw::HeaderBar>,
-        #[template_child]
         pub room_topic: TemplateChild<gtk::Label>,
         #[template_child]
         pub accept_button: TemplateChild<SpinnerButton>,
@@ -41,6 +39,7 @@ mod imp {
         fn class_init(klass: &mut Self::Class) {
             Pill::static_type();
             SpinnerButton::static_type();
+            LabelWithWidgets::static_type();
             Self::bind_template(klass);
             klass.set_accessible_role(gtk::AccessibleRole::Group);