Rename “Current Playlist” and “Playlist Catalogue” context menus

Use action-oriented and more descriptive titles

"Add to Playlist..." instead of "Playlist Catalogue"
- "Add to Existing Playlist" instead of "Add to Playlist"
- "Add to New Playlist" (unchanged)

- "Playing Next..." instead of "Current Playlist"

In WPS context menu:

- "Current Playlist" instead of "Playlist"

Change-Id: I5cce9e317676537988682f46ac6b920598af3b9e

manual/rockbox_interface/wps.tex

@@ -179,8 +179,8 @@ several indicators.
 Like the context menu for the \setting{File Browser}, the \setting{WPS Context Menu}
 allows you quick access to some often used functions.
 
-\subsubsection{Playlist}
-The \setting{Playlist} submenu allows you to view, save, search, reshuffle,
+\subsubsection{Current Playlist}
+The \setting{Current Playlist} submenu allows you to view, save, search, reshuffle,
 and display the play time of the current playlist. These and other operations
 are detailed in \reference{ref:working_with_playlists}. To change settings for
 the \setting{Playlist Viewer} press \ActionStdContext{} while viewing the
@@ -198,12 +198,12 @@ menu, you can find the \setting{Playlist Viewer Settings}.
   \end{description}
 
 
-\subsubsection{Playlist catalogue}
+\subsubsection{Add to Playlist...}
   \begin{description}
-    \item [Add to playlist.] Adds the currently playing file to a playlist.
+    \item [Add to Existing Playlist.] Adds the currently playing file to a playlist.
     Select the playlist you want the file to be added to and it will get
     appended to that playlist.
-    \item [Add to new playlist.] Similar to the previous entry this will
+    \item [Add to New Playlist.] Similar to the previous entry this will
     add the currently playing track to a playlist. You need to enter a name
     for the new playlist first.
   \end{description}