Server transfers should be free (at least in language diverse regions) + servers need language tags

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I think I prefer Spanman in this case. Sounds like a superhero from the 50's.

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That would be cool. I think I would worry about potential security exploits, but if they can make it work integrating translate itself could have some definite benefits.

I think I would still want a vetted auto-fill dictionary of phrases relevant to the game in the top languages spoken by users and some basic 'gamer' jargon/courtesies, which Google translate doesn't handle as easily. Having both tools would be ideal.

The language tag would still be useful in such a case for establishing an in initial population and what language you give courtesy to. I think you bring up a reasonable point relative to server merges. I think if you had both tools available people would also be more accepting of slapping a french/english tag together and then switching to 'global - time zone' style tag after yet another merge. After all the original populations are small enough at that point that it stops making sense to decide courtesy that way.

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To clarify, the reason I feel a dictionary might still be necessary even with direct translation is some gaming communities (the particular examples I know of in particular are German and Japanese) have different words for specific concepts in things like combat games and mmos that are more so references as a result of their own communities history, memes, and culture. I know in some cases even small idioms from different aspects of life can come up occasionally and unless you already know what that cultures idioms are or know what their jargon is derived from, google translate won't help you as well as an autofill direct dictionary vetted by translators who know the community might. I do agree though that even without it google translate could help people bumble through it. But it would be bumbling. Autofill dictionaries have the side benefit, on the other hand, of making typing in party chat easier to say strategic things more quickly. So, it's a QoL buff in multiple ways.

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Yeah it really does shape the way you think. I personally prefer to hang out on servers that don't speak my native language when a translate tool is available. It's usually relaxing and refreshing to hang around different mindsets for me and it's really easy to encounter them that way due to that shaping effect.