Style tabs, add missing drawables

OpenKeychain/src/main/res/layout/help_activity.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
@@ -9,15 +10,17 @@
 
     <LinearLayout
         android:layout_below="@id/toolbar"
-
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical">
 
-        <org.sufficientlysecure.keychain.ui.widget.SlidingTabLayout
+        <com.astuetz.PagerSlidingTabStrip
             android:id="@+id/sliding_tab_layout"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content" />
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            android:textColor="#FFFFFF"
+            app:pstsIndicatorColor="#FFFFFF" />
 
         <android.support.v4.view.ViewPager
             android:id="@+id/pager"

OpenKeychain/src/main/res/layout/view_key_activity.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
@@ -46,10 +47,13 @@
             android:visibility="gone"
             android:id="@+id/view_key_status_divider" />
 
-        <org.sufficientlysecure.keychain.ui.widget.SlidingTabLayout
+        <com.astuetz.PagerSlidingTabStrip
             android:id="@+id/view_key_sliding_tab_layout"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content" />
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            android:textColor="#FFFFFF"
+            app:pstsIndicatorColor="#FFFFFF" />
 
         <android.support.v4.view.ViewPager
             android:id="@+id/view_key_pager"

OpenKeychain/src/main/res/raw/help_start.html

@@ -8,7 +8,7 @@ And don't add newlines before or after p tags because of transifex -->
 <h2>Getting started</h2>
 <p>First you need a personal key. Create one via the menu in "Keys" or import existing secret keys. Afterwards, you can download your friends' keys or exchange them via QR Codes or NFC.</p>
 
-<p>On Android lower 4.4, it is recommended that you install <a href="market://details?id=org.openintents.filemanager">OI File Manager</a> for enhanced file selection. To share via QR Codes install <a href="market://details?id=com.google.zxing.client.android">Barcode Scanner</a>. Clicking on the links will open Google Play Store or F-Droid for installation.</p>
+<p>On Android lower 4.4, it is recommended that you install <a href="market://details?id=org.openintents.filemanager">OI File Manager</a> for enhanced file selection.</p>
 
 <h2>I found a bug in OpenKeychain!</h2>
 <p>Please report the bug using the <a href="https://github.com/openpgp-keychain/openpgp-keychain/issues">issue tracker of OpenKeychain</a>.</p>