[a11y] Improve accessibility of screen headers.

libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/viewer/MediaViewerView.kt

@@ -55,6 +55,8 @@ import androidx.compose.ui.layout.onVisibilityChanged
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalInspectionMode
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.clearAndSetSemantics
+import androidx.compose.ui.semantics.contentDescription
 import androidx.compose.ui.semantics.heading
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.text.style.TextOverflow
@@ -495,14 +497,20 @@ private fun MediaViewerTopBar(
     TopAppBar(
         title = {
             if (senderName != null && dateSent != null) {
+                val description = stringResource(
+                    CommonStrings.a11y_sent_by_sender_at_date,
+                    senderName,
+                    dateSent,
+                )
                 Column(
                     modifier = Modifier
                         .fillMaxWidth()
+                        .clearAndSetSemantics {
+                            heading()
+                            contentDescription = description
+                        },
                 ) {
                     Text(
-                        modifier = Modifier.semantics {
-                            heading()
-                        },
                         text = senderName,
                         style = ElementTheme.typography.fontBodyMdMedium,
                         color = ElementTheme.colors.textPrimary,

libraries/ui-strings/src/main/res/values/localazy.xml

@@ -48,6 +48,7 @@
   <string name="a11y_room_avatar">"Room avatar"</string>
   <string name="a11y_send_files">"Send files"</string>
   <string name="a11y_sender_location">"Sender location"</string>
+  <string name="a11y_sent_by_sender_at_date">"Sent by %1$s at %2$s"</string>
   <string name="a11y_session_verification_time_limited_action_required">"Time limited action required, you have one minute to verify"</string>
   <string name="a11y_settings_with_required_action">"Settings, action required"</string>
   <string name="a11y_show_password">"Show password"</string>