chat_viewer_item: 4 lines input and bottom send button.

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

@@ -51,7 +51,7 @@
         android:hint="@string/chat_input_hint"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:maxLines="5"
+        android:maxLines="4"
         android:scrollbars="vertical"
         android:fadingEdge="vertical"
         android:focusable="true"
@@ -67,7 +67,9 @@
         android:padding="8dp"
         android:src="@drawable/ic_button_send"
         android:background="@null"
-        android:contentDescription="@string/chat_send" />
+        android:contentDescription="@string/chat_send"
+        android:layout_gravity="bottom"
+        />
     </LinearLayout>
 
 </RelativeLayout>