Plugin settings per site/locale

Question

I'm trying to make a plugin in Craft 3 but want it to be possible to set different settings for each separate site or locale. How would I go about doing this?

Answer 1

Edit

OP updated the question to specify Craft 3, so this is no longer relevant.

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You can define a separate value for each locale, as described in the localisation documentation:

<?php

return [
    'flagName' => [
        'de' => 'Bundesflagge',
        'fr' => 'Tricolore',
    ],
];