Upgraded Material Dialogs

- native material progress dialog
- auto hide keyboard when saving

app/src/main/res/layout/dialog_loading.xml

@@ -1,25 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-              android:layout_width="match_parent"
-              android:layout_height="match_parent"
-              android:orientation="horizontal">
-
-    <ProgressBar
-        android:id="@+id/progressBar1"
-        style="?android:attr/progressBarStyle"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_centerHorizontal="true"
-        android:layout_gravity="center_vertical"/>
-
-    <TextView
-        android:id="@+id/text"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_gravity="center_vertical"
-        android:fontFamily="sans-serif"
-        android:paddingLeft="16dp"
-        android:textAppearance="?android:textAppearanceMedium"
-        android:textColor="?title_text_color"
-        android:textSize="18sp"/>
-</LinearLayout>

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

@@ -49,6 +49,7 @@
     <string name="track_hint">Track (2 for track 2 or 3004 for CD3 track 4)</string>
     <string name="album_or_artist_empty">The album title or the album artist text field is empty.</string>
     <string name="writing_file_number">Writing file</string>
+    <string name="saving_changes">Saving changes…</string>
     <string name="title_activity_album_tag_editor">AlbumTagEditorActivity</string>
     <string name="label_details">Details</string>
     <string name="label_file_name">File name</string>