Gridview and language issue

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Android

Gridview

My app shows a gridview which is a month view. When the phone system language is English, everything is great but if I change the system language to any other language then the gridview disappear. anyone?

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:removed="@drawable/background_wood">
    <ImageButton
        android:layout_width="75dp"
        android:layout_height="80dp"
        android:id="@+id/prev_month_btn"
        android:src="@drawable/arrow_left"
        android:scaleType="fitXY"
        android:alpha="0.6"
        android:paddingTop="5dp"
        android:background="@drawable/background_wood"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true">
    </ImageButton>
    <ImageButton
        android:layout_width="75dp"
        android:layout_height="80dp"
        android:id="@+id/next_month_btn"
        android:src="@drawable/arrow_right"
        android:paddingTop="5dp"
        android:scaleType="fitXY"
        android:alpha="0.6"
        android:background="@drawable/background_wood"
        android:layout_alignTop="@+id/prev_month_btn"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true">
    </ImageButton>
    <TextView
        android:layout_width="wrap_removed"
        android:layout_height="wrap_removed"
        android:layout_centerHorizontal="true"
        android:text="YEAR"
        android:id="@+id/year"
        android:textSize="30sp"
        android:paddingTop="5dp"
        android:textStyle="bold">
    </TextView>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="MONTH"
        android:id="@+id/month_picker"
        android:paddingTop="5dp"
        android:paddingBottom="10dp"
        android:layout_gravity="bottom"
        android:gravity="center|center_horizontal"
        android:layout_alignBottom="@+id/prev_month_btn"
        android:layout_centerHorizontal="true" />
    <GridView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/grid_view_of_month"
        android:numColumns="7"
        android:paddingTop="25dp"
        android:listSelector="@drawable/grid_selector"
        android:layout_below="@+id/prev_month_btn"
        android:alpha="0.4"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true">
    </GridView>

</RelativeLayout>

public class CustomGridAdapter extends BaseAdapter {

private Context context;
LayoutInflater inflater;
ArrayList<Integer>days;
ArrayList<Object> keySize;

public CustomGridAdapter(Context context, ArrayList<Integer> days, ArrayList<Object> keySize) {
    super();
    this.context = context;
    this.days = days;
    this.keySize = keySize;
    inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {
        convertView = inflater.inflate(R.layout.cell, null);
    }
    Button button = (Button) convertView.findViewById(R.id.grid_item);
    button.setText(days.get(position).toString());

    if(!keySize.isEmpty()) {
        TextView textView = (TextView) convertView.findViewById(R.id.numberOfEvents);
        textView.setText(keySize.get(position).toString());
        if(keySize.get(position).toString() == String.valueOf(0)){
            textView.setText("");
        }
        return convertView;
    }
    return convertView;
}


@Override
public int getCount() {
    return days.size();
}

@Override
public Object getItem(int position) {

    return days.get(position);
}

@Override
public long getItemId(int position) {
        return position;
    }
}

What I have tried:

I tried to change XML but nothing, tried to play with the adapter and getView still nothing.