Image editor: added content descriptions

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

@@ -21,7 +21,9 @@
         android:layout_height="36dp"
         android:layout_marginTop="12dp"
         android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:contentDescription="@string/ic_rotate_right_24"
         android:scaleType="fitCenter"
+        android:tooltipText="@string/ic_rotate_right_24"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/civ"
@@ -35,7 +37,9 @@
         android:layout_marginStart="12dp"
         android:layout_marginTop="12dp"
         android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:contentDescription="@string/ic_flip_24_horizontally"
         android:scaleType="fitCenter"
+        android:tooltipText="@string/ic_flip_24_horizontally"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toEndOf="@id/ibRotate"
         app:layout_constraintTop_toBottomOf="@id/civ"
@@ -49,7 +53,9 @@
         android:layout_marginStart="12dp"
         android:layout_marginTop="12dp"
         android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:contentDescription="@string/ic_flip_24_vertically"
         android:scaleType="fitCenter"
+        android:tooltipText="@string/ic_flip_24_vertically"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toEndOf="@id/ibFlipHorizontally"
         app:layout_constraintTop_toBottomOf="@id/civ"