Allow arabic / chinese script characters

[svitiashchuk]

There are queries that are not considered as valid, but google/opencage geocoder allows to use it while geocoding. For example:

Chinese:

{
  "provider": "opencage",
  "address": "北京",
  "latlng": {
    "lat": 0,
    "lng": 0
  },
  "query": {
    "country": "cn"
  }
}

Arabic:

{
  "provider": "opencage",
  "address": "روات",
  "latlng": {
    "lat": 0,
    "lng": 0
  },
  "query": {
    "country": "pk"
  }
}

Such queries produces error.

{
  "error": "2 UNKNOWN: invalid query {Address:北京 Provider:opencage Lat:0 Lng:0 Query:map[country:cn]}"
}

It would be good if it is possible to geocode such addresses. Seems like regex validation should be tuned a little.