Following is arb file, it's used for localization purpose, the text in first column is constant and the text in second column is the translation and can vary from language to language.
I am providing you english translation file, you need to convert constant variables names in the first column to be meaningful.
```
{
    "@@locale": "en",
    "counterAppBarTitle": "Counter",
    "@counterAppBarTitle": {
        "description": "Text shown in the AppBar of the Counter Page"
    },
    "bookNow": "Book Now",
    "from": "From",
    "perAdult": "per adult",
    "duration": "Duration",
    "transfer": "Transfer",
    "tours": "Tours",
    "menu": "Menu",
    "age": "Age: {ageRange}",
    "@age": {
        "description": "Age range of the person",
        "placeholders": {
            "ageRange": {
                "type": "String",
                "example": "5 - 65 max"
            }
        }
    }
}
```