Here you can read about both the language differences of idioms used by the various ethnic groups and the growth of a Universal Language, spoken by a lot of individuals that use it in the relationships for their trades in the Redemption - The Third Era' world.
In our post-apocalyptic game scenario, we assume that communication is a priority that affects all races and it is not unusual that many people could be able at least to understand the various idioms on their own.
The following picture symbolizes the previous concepts:
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