Fix typos in Polish translations and a few missing translations.

MyTracks/libs/README.txt

@@ -0,0 +1,17 @@
+The libraries contained here in binary format are licensed according to their
+own licenses, which allow their usage for the My Tracks application. Any other
+applications that wish to use these files should consult the appropriate
+licenses or the JAR's authors.
+
+References are provided to the libraries:
+
+accounts.jar (Android accounts library):
+http://code.google.com/p/libs-for-android/wiki/AccountsLibrary
+
+google-api-client-*.jar (GData client):
+http://code.google.com/p/google-api-java-client/
+
+google-common.jar,
+googleloginclient-helper.jar,
+libmymaps.jar (Google My Maps upload library):
+Licensed exclusively for use in My Tracks and derived Android applications.