Use Iconics for intro swipe icon

app/src/main/java/i2p/bote/android/intro/IntroActivity.java

@@ -12,6 +12,8 @@ import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.TextView;
 
+import com.mikepenz.google_material_typeface_library.GoogleMaterial;
+import com.mikepenz.iconics.IconicsDrawable;
 import com.viewpagerindicator.LinePageIndicator;
 
 import i2p.bote.android.BoteActivityBase;
@@ -131,10 +133,19 @@ public class IntroActivity extends BoteActivityBase {
                         }
                     });
                     return v5;
+
                 default:
                     View v0 = inflater.inflate(R.layout.fragment_intro_0, container, false);
                     TextView tv = (TextView) v0.findViewById(R.id.intro_app_name);
                     tv.append(".");
+
+                    TextView swipe = (TextView) v0.findViewById(R.id.intro_swipe_to_start);
+                    swipe.setCompoundDrawablesWithIntrinsicBounds(
+                            new IconicsDrawable(getActivity(), GoogleMaterial.Icon.gmd_arrow_back)
+                                    .colorRes(R.color.md_grey_600).sizeDp(24).paddingDp(4),
+                            null, null, null
+                    );
+
                     return v0;
             }
         }

app/src/main/res/layout-land/fragment_intro_0.xml

@@ -64,11 +64,11 @@
     </LinearLayout>
 
     <TextView
+        android:id="@+id/intro_swipe_to_start"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="@dimen/activity_vertical_margin"
         android:text="@string/swipe_to_start"
-        android:drawableLeft="@drawable/ic_arrow_back_grey600_24dp"
         android:gravity="center_vertical"
         android:layout_gravity="center_horizontal" />
 

app/src/main/res/layout/fragment_intro_0.xml

@@ -43,11 +43,11 @@
         android:layout_gravity="center_horizontal" />
 
     <TextView
+        android:id="@+id/intro_swipe_to_start"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="@dimen/activity_vertical_margin"
         android:text="@string/swipe_to_start"
-        android:drawableLeft="@drawable/ic_arrow_back_grey600_24dp"
         android:gravity="center_vertical"
         android:layout_gravity="center_horizontal" />
 </LinearLayout>