Fixes #1600

Change "Set as available offline" text to "Available offline" for switch widget in file details dialog, to differnetiate between this and "Set as available offline" in menu

src/main/res/layout/file_details_fragment.xml

@@ -166,7 +166,7 @@
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:layout_gravity="start"
-				android:text="@string/favorite"
+				android:text="@string/favorite_switch"
 				android:textSize="16sp"
 				android:layout_alignParentTop="true"
 				android:layout_alignParentLeft="true"

src/main/res/values/strings.xml

@@ -270,6 +270,7 @@
     <string name="unfavorite">Unset as available offline</string>
     <string name="favorite_real">Set as favorite</string>
     <string name="unset_favorite_real">Unset favorite</string>
+    <string name="favorite_switch">Available offline</string>
     <string name="common_rename">Rename</string>
     <string name="common_remove">Remove</string>
     <string name="confirmation_remove_file_alert">"Do you really want to remove %1$s?"</string>