Updates Mapping navigation to filter layer items by current language

[Huyeng]

Updates code to show:

• List layer item by current language
• If Any layers that no assigned to any English and Khmer, it will be shown on both Sites.
• If the main category has only a layer, and that layer is assigned for English only, so the category and its layer won't appear on Khmer/other sites, but English will be displayed.
• If the category has only a sub-cat that contains a layer assigned for English, so the category, sub category and its layer won't appear on Khmer/other sites, but English will be displayed.

[prustar]

@Huyeng Great I'll let ODV know that it'll be resolved shortly. Thanks, P