i18n Needs to be re-written with interpolation

[Tibesnoff]

Description
i18n is set up weirdly
It needs to be re-written to support interpolation

Acceptance Criteria

• Code is re-written to use interpolation when needed
• We can use a setup like this i18n.t("Common.Hello", {{Name: "Tyler"}}); we can add multiple variables
• We also need to add pluralization to the code
• We want fewer front-end auth errors and get the auth errors from the backend. Make sure the front and backend support each other.

Additional context (optional)

https://www.i18next.com/translation-function/interpolation