fix(message): This itinerary is too long

Description

A too long itinerary generates a technical error message instead of explaining to the user what's wrong

Screenshots

Technical details

There is an error message when you try to compute a too long itinerary "err: Code=DistanceExceeded etc.". Would better display something like "This itinerary is too long". Or add flights options if available. Eg: From: select location in India and To: select location in New Zealand

Tests

1. From: Select location in India and To: select location in New Zealand should display message "This itinerary is too long".
2. Select from and to location in the same city should display Navigation Route

Issues

#89

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