📝 Add user preferences doc

apps/docs/docs/workspace/preferences.md

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+# User preferences
+
+## Change language
+
+You can change the language of the application by going to your `Settings & Members` menu under the `Preferences` tab.
+
+<img src="/img/workspace/change-language.png" alt="Change language" />
+
+:::note
+The application is still being translated, so some parts may not be translated yet. This is tracked in [this issue](https://github.com/baptisteArno/typebot.io/issues/210).
+:::

apps/docs/docs/workspace/upgrade.md

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----
-sidebar_position: 3
----
-
-# Upgrade plan
-
-In order to upgrade your workspace plan and increase your monthly limits, you need to open the `Settings & Members` modal in your homepage and navigate on the `Billing & Usage` tab.
-
-This tab displays your bots total usage, your current plan and paid invoices.
-
-<img src="/img/workspace/billing.jpeg" alt="Billing and usage tab" />
-
-You can choose to upgrade to your desired plan here.