fix(translations): update etTranslations type to DefaultTranslationsObject

[tristankrass]

After merging this PR: #10169 the estonian language pack has been published, but since the translation type was not correct, it meant en wasn't used as a fallback lanugage, which resulted the whole app to crash:
In the Browser the following error is shown, if Estonian language is picked.

Error: Cannot read properties of undefined (reading 'default')
    at resolveErrorDev (webpack-internal:///(app-pages-browser)/./node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]/node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js:1792:63)
    at processFullStringRow (webpack-internal:///(app-pages-browser)/./node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]/node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js:2071:17)
    at processFullBinaryRow (webpack-internal:///(app-pages-browser)/./node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]/node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js:2059:7)
    at progress (webpack-internal:///(app-pages-browser)/./node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]/node_modules/next/dist/compiled/react-server-dom-webpack/cjs/react-server-dom-webpack-client.browser.development.js:2262:17)

Fixes #

This is now fixed by adding the correct type to the translation object.