change GB translations to use en_GB

[plastikfan]

Currently, en_GB uses the en file. This should now be changed to be en_GB, now that the locale has been correctly setup using locale-gen

This is the error message that is generated as a result of trying to load en/translation.json, that initially was missing:

===> cwd: '/home/plastikfan/dev/github/snivilization/zoon/packages/infexor'
[
  [Error: ENOENT: no such file or directory, open './locales/en/translation.json'] {
    errno: -2,
    code: 'ENOENT',
    syscall: 'open',
    path: './locales/en/translation.json'
  }
]

The only way I could get rid of this message was to create a dummy en/transaltion file.

i18next is composing a list of languages to load and since we provide this config:

const OUT = "dist"; // should come from rollup.options.mjs ...
const EN_GB = "en-GB";
const EN_US = "en-US";
const TRANSLATION = "translation";

export default {
  backend: {
    loadPath: `./${OUT}/locales/{{lng}}/{{ns}}.json`
  },
  fallbackLng: EN_GB,
  preload: [EN_GB, EN_US],
  ns: [TRANSLATION],
  defaultNS: TRANSLATION
};

it tries to load "en-GB", "en-US" and "en". Why does it try and load "en"?

This issue is fixed by using a load strategy:

const OUT = "dist"; // should come from rollup.options.mjs ...
const EN_GB = "en-GB";
const EN_US = "en-US";
const TRANSLATION = "translation";

export default {
  backend: {
    loadPath: `./${OUT}/locales/{{lng}}/{{ns}}.json`
  },
  load: 'currentOnly',
  fallbackLng: EN_GB,
  preload: [EN_GB, EN_US],
  ns: [TRANSLATION],
  defaultNS: TRANSLATION
};

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