Design fixes for decryption screen

Graphics/get-material-icons.sh

@@ -35,6 +35,7 @@ python copy OpenKeychain navigation grey close 24
 python copy OpenKeychain social grey person 24
 python copy OpenKeychain social grey person_add 24
 python copy OpenKeychain social grey share 24
+python copy OpenKeychain communication grey vpn_key 24
 
 # navigation drawer sections
 python copy OpenKeychain communication black vpn_key 24

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptFragment.java

@@ -243,7 +243,7 @@ public abstract class DecryptFragment extends Fragment {
 
     private void setShowAction(final long signatureKeyId) {
         mSignatureAction.setText(R.string.decrypt_result_action_show);
-        mSignatureAction.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_action_accounts, 0);
+        mSignatureAction.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_vpn_key_grey_24dp, 0);
         mSignatureLayout.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {

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

@@ -118,7 +118,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="match_parent"
                 android:text="Show"
-                android:drawableRight="@drawable/ic_action_accounts"
+                android:drawableRight="@drawable/ic_vpn_key_grey_24dp"
                 android:drawablePadding="8dp"
                 android:gravity="center_vertical"
                 style="@style/SelectableItem" />

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

@@ -1002,7 +1002,7 @@
     <string name="msg_dc_error_pgp_exception">"Encountered OpenPGP Exception during operation!"</string>
     <string name="msg_dc_integrity_check_ok">"Integrity check OK!"</string>
     <string name="msg_dc_ok_meta_only">"Only metadata was requested, skipping decryption"</string>
-    <string name="msg_dc_ok">"OK"</string>
+    <string name="msg_dc_ok">"Decryption/Verification finished"</string>
     <string name="msg_dc_pass_cached">"Using passphrase from cache"</string>
     <string name="msg_dc_pending_nfc">"NFC token required, requesting user input…"</string>
     <string name="msg_dc_pending_passphrase">"Passphrase required, requesting user input…"</string>