use SuperToast instead of AppMsg in code, part 1

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

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:bootstrapbutton="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="wrap_content"
     android:layout_height="match_parent">

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

@@ -4,6 +4,12 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent" >
 
+    <LinearLayout
+        android:id="@+id/card_container"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical" />
+
     <include layout="@layout/key_list_content"/>
 
     <include layout="@layout/drawer_list" />

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

@@ -656,6 +656,7 @@
     <string name="msg_mf_unlock">Unlocking keyring</string>
 
     <!-- unsorted -->
+    <string name="internal_error">Internal error!</string>
     <string name="section_certifier_id">Certifier</string>
     <string name="section_cert">Certificate Details</string>
     <string name="label_user_id">Identity</string>