OSM "level" translation in fluent with alternative versions when travelling in foreign countries

playground.ftl

### input data: ground floor = level 0
### for OSM "level" tag, see https://wiki.openstreetmap.org/wiki/Key:level

### KNOWN BUGS:
### 1. I cannot remove the minus (-) sign from negative levels. See https://github.com/projectfluent/fluent/issues/228
### 2. I cannot properly calculate +1 for the US style. See https://github.com/projectfluent/fluent/issues/227

## SYNTAX: floor_<userlanguage>_<country-travelling-to>
## i.e. e.g. floor_DE_EUROP = German-speaking user travelling to Germany (or any other country with basement=level 0)

## Euopean user (e.g. German user)

# German/European country, German-speaking user
floor_DE_EUROP =
    { $level ->
        [-2] im { $level }. Untergeschoss
        [-1] im 1. Untergeschoss
        [0] im Erdgeschoss
        [one] im 1. Obergeschoss
       *[other] im { $level }. Obergeschoss
    }

# US style country, German-speaking user 
# = German user travelling to US
floor_DE_USSTYLE =
    { $level ->
        [-2] im Untergeschoss B{ $level }
        [-1] Im Untergeschoss B(1)
        [0] im Erdgeschoss
        [one] im 1. Obergeschoss (2. Geschoss inklusive Erdgeschoss)
       *[other] im  { $level }. Geschoss ({ $level }+1. Geschoss inklusive Erdgeschoss)
    }

## US user (i.e. US locale)

# US style, US user
floor_EN_USSTYLE =
    { $level ->
        [-2] on basement floor B{ $level }
        [-1] on basement floor B(1)
        [0] on ground floor
        [one] on floor 2
       *[other] on floor { $level }+1
    }

# German/European style, English-speaking user
# = US user travelling to Germany
floor_EN_EUROP =
    { $level ->
        [-2] on basement floor { $level }
        [-1] basement floor 1
        [0] on ground floor
        [one] on floor 2 (floor one without ground floor)
       *[other] on floor { $level }+1 (floor { $level } without ground floor)
    }

playground.json

{
    "level": 1
}

setup.json

{
    "locale": "en-US",
    "dir": "ltr"
}