Update some text descriptions to ease translations.

Some strings didn't mention the context in which they are used
(for example as item in a list, or for accessibility). This makes it
harder for translators to choose the most appropriate translation and
grammar.

Also fix repeat and shuffle mode button accessibility descriptions to
indicate the action, not the current state.

PiperOrigin-RevId: 426924163

libraries/session/src/main/res/values/strings.xml

@@ -14,18 +14,18 @@
      limitations under the License.
 -->
 <resources>
-    <!-- Notification channel name for default media notification. [CHAR LIMIT=40] -->
+    <!-- Notification channel name for a notification about the current media playback. This name is visible to the user as a list entry in the system settings page for the notifications of the app. [CHAR LIMIT=40] -->
     <string name="default_notification_channel_name">Now playing</string>
-    <!-- Content description of 'play' button on media notification for accessibility (not shown on the screen). [CHAR LIMIT=NONE] -->
+    <!-- Accessibility description for a 'play' button on a media notification. [CHAR LIMIT=NONE] -->
     <string name="media3_controls_play_description">Play</string>
-    <!-- Content description of 'pause' button on media notification for accessibility (not shown on the screen). [CHAR LIMIT=NONE] -->
+    <!-- Accessibility description for a 'pause' button on a media notification. [CHAR LIMIT=NONE] -->
     <string name="media3_controls_pause_description">Pause</string>
-    <!-- Content description of 'seek to previous item' button on media notification for accessibility (not shown on the screen). [CHAR LIMIT=NONE] -->
+    <!-- Accessibility description for a 'seek to previous item' button on a media notification. [CHAR LIMIT=NONE] -->
     <string name="media3_controls_seek_to_previous_description">Seek to previous item</string>
-    <!-- Content description of 'seek to next item' button on media notification for accessibility (not shown on the screen). [CHAR LIMIT=NONE] -->
+    <!-- Accessibility description for a 'seek to next item' button on a media notification. [CHAR LIMIT=NONE] -->
     <string name="media3_controls_seek_to_next_description">Seek to next item</string>
-    <!-- Content description of 'seek back' for rewind button on media notification for accessibility (not shown on the screen). [CHAR LIMIT=NONE] -->
+    <!-- Accessibility description for a 'seek back' or 'rewind' button on a media notification. [CHAR LIMIT=NONE] -->
     <string name="media3_controls_seek_back_description">Seek back</string>
-    <!-- Content description of 'seek forward' for fast-forward button on media notification for accessibility (not shown on the screen). [CHAR LIMIT=NONE]  -->
+    <!-- Accessibility description for a 'seek forward' or 'fast-forward' button on a media notification. [CHAR LIMIT=NONE]  -->
     <string name="media3_controls_seek_forward_description">Seek forward</string>
 </resources>