Added material design icons for the current used icons

fints4javaAndroidApp/src/main/res/layout/app_bar_main.xml

@@ -28,6 +28,6 @@
             android:layout_height="wrap_content"
             android:layout_gravity="bottom|end"
             android:layout_margin="@dimen/fab_margin"
-            app:srcCompat="@android:drawable/ic_input_add" />
+            app:srcCompat="@drawable/ic_add_white_48dp" />
 
 </android.support.design.widget.CoordinatorLayout>

fints4javaAndroidApp/src/main/res/menu/menu_main.xml

@@ -4,7 +4,7 @@
 
 
     <item android:id="@+id/mnitmSearchTransactions"
-          android:icon="@android:drawable/ic_menu_search"
+          android:icon="@drawable/ic_search_white_24dp"
           android:title="@string/search"
           app:showAsAction="always|collapseActionView"
           app:actionViewClass="android.support.v7.widget.SearchView"
@@ -13,7 +13,7 @@
     />
 
     <item android:id="@+id/mnitmUpdateTransactions"
-          android:icon="@android:drawable/stat_notify_sync"
+          android:icon="@drawable/ic_cached_white_24dp"
           android:title="@string/menu_main_update_transactions"
           app:showAsAction="always"
           android:orderInCategory="200"