Pale Moon: improve description to close #700

apps/Pale Moon Browser/description

@@ -1,3 +1,9 @@
-Lightweight browser focusing on efficiency and customization.
+Forked from Firefox long ago, lightweight and customizaeble web browser.
+Pale Moon offers you a browsing experience in a browser completely built
+from its own, independently developed source that has been forked off from
+Firefox/Mozilla code a number of years ago, with carefully selected
+features and optimizations to improve the browser's stability and user
+experience, while offering full customization and a growing collection of
+extensions and themes to make the browser truly your own.
 
 To run: Menu -> Internet -> Pale Moon