Reworded and shortened some strings

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

@@ -65,7 +65,7 @@
     <string name="portrait">Portrait</string>
     <string name="landscape">Landscape</string>
     <string name="default_columns">Default</string>
-    <string name="pref_library_update_interval">Library update period</string>
+    <string name="pref_library_update_interval">Library update frequency</string>
     <string name="pref_update_only_non_completed">Only update incomplete manga</string>
     <string name="update_never">Manual</string>
     <string name="update_1hour">Hourly</string>
@@ -75,8 +75,8 @@
     <string name="update_12hour">Every 12 hours</string>
     <string name="update_24hour">Daily</string>
     <string name="update_48hour">Every 2 days</string>
-    <string name="pref_auto_update_manga_sync">Automatically update last chapter read in enabled services</string>
-    <string name="pref_ask_update_manga_sync">Ask for confirmation before updating</string>
+    <string name="pref_auto_update_manga_sync">Sync chapters after reading</string>
+    <string name="pref_ask_update_manga_sync">Confirm before updating</string>
 
       <!-- Reader section -->
     <string name="pref_hide_status_bar">Hide status bar</string>
@@ -108,7 +108,7 @@
 
       <!-- Downloads section -->
     <string name="pref_download_directory">Downloads directory</string>
-    <string name="pref_download_slots">Simultaneous downloads</string>
+    <string name="pref_download_slots">Maximum simultaneous downloads</string>
     <string name="pref_download_only_over_wifi">Only download over Wi-Fi</string>
 
       <!-- Advanced section -->