Fixes to strings.xml, new screenshots, app description and README.md

app/src/main/res/values/strings.xml

@@ -92,15 +92,15 @@
     <string name="pref_compass_title">Use sensors to rotate PolarView</string>
 
     <string name="splash_tle_title" translatable="false">Two-Line Element set</string>
-    <string name="splash_tle_msg">Look4Sat uses a TLE set to compute the position of
-        the satellites. The TLE data looses precision over time, so it is recommended to update
-        it weekly via the buttons in the Satellites tab</string>
+    <string name="splash_tle_msg">Look4Sat uses a TLE set to calculate the satellite positions.
+        The TLE data looses precision over time, so it is recommended to update
+        it weekly using the buttons in the Satellites menu</string>
     <string name="splash_loc_msg">Look4Sat needs to know your position to deliver the accurate
         passes predictions. Please set the position using the buttons (GPS, QTH Locator)
-        in the Settings tab</string>
+        in the Settings menu</string>
 
     <string name="info_version">Version: %s</string>
-    <string name="info_subtitle">Satellite tracker for Android</string>
+    <string name="info_subtitle">Satellite tracker and pass predictor</string>
     <string name="info_github" translatable="false">GitHub</string>
     <string name="info_fdroid" translatable="false">F-Droid</string>
     <string name="info_bmc">Buy me a coffee</string>