- Add missing translations to account/users & signin routes

[bjarneo]

Thank you, @ltguillaume This PR includes commits from this: https://github.com/HemmeligOrg/Hemmelig.app/pull/299

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This pull request primarily focuses on internationalization (i18n) improvements in the client/routes/account/users.jsx and client/routes/signin/index.jsx files, and the corresponding translations in public/locales/en/translation.json and public/locales/nl/translation.json. The changes involve replacing hard-coded strings with calls to the translation function t(), which will allow for easier localization of the application in different languages.

Internationalization improvements:

• client/routes/account/users.jsx: Replaced hard-coded strings in the Users function with calls to the translation function t(). This includes strings in the openDeleteModal, error message, input labels and placeholders, and table headers. [1] [2] [3] [4]
• client/routes/signin/index.jsx: Replaced the hard-coded error message in the SignIn function with a call to the translation function t().

Translation changes:

• public/locales/en/translation.json: Added translations for the strings used in client/routes/account/users.jsx and client/routes/signin/index.jsx, and made minor corrections to existing translations. [1] [2] [3] [4]
• public/locales/nl/translation.json: Made similar changes as in the English translations, and also improved some existing Dutch translations. [1] [2] [3] [4] [5]

[sonarcloud[bot]]

Quality Gate passed

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