Small new user improvements (#1143)

- Changed empty library string
- Added empty view for Categories

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

@@ -19,4 +19,11 @@
         app:srcCompat="@drawable/ic_add_white_24dp"
         style="@style/Theme.Widget.FAB"/>
 
+    <eu.kanade.tachiyomi.widget.EmptyView
+        android:id="@+id/empty_view"
+        android:visibility="gone"
+        android:layout_width="wrap_content"
+        android:layout_gravity="center"
+        android:layout_height="wrap_content" />
+
 </FrameLayout>

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

@@ -13,10 +13,12 @@
 
     <TextView
         android:id="@+id/text_label"
+        android:layout_margin="16dp"
         style="@style/TextAppearance.Medium.Body2.Hint"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@+id/image_view"
+        android:gravity="center"
         android:layout_centerHorizontal="true"/>
 
 </RelativeLayout>

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

@@ -1,7 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent">