Added internal culture max name length setting.

Switches over to using Exceptions to catch the differing issues a name could have.

Adds new more-specific language strings and removes the old generic one.

Description:

New Nodes/Commands/ConfigOptions:

New Config Node: townycultures.maximum_culture_name_length

Default: 20
The maximum number of characters a culture name can be.

Relevant Issue ticket:

[ ] I have tested this pull request for defects on a server.

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TownyAdvanced / TownyCultures