Translate useEffect reference (#431)

* Translate Intro and Reference

* Minor fixes based on comments from previous  PR

* Translate Usage: Connecting to an external system

* Translate Usage: Connecting to an external system - examples

* Translate Usage: Wrapping Effects in custom Hooks

* Translate Usage: Controlling a non-React widget

* Fix minor issues

* Translage Usage: Fetching data with effects

* Translate Usage: Specifying reactive dependencies

* Translate Usage: Specifying reactive dependencies: Examples

* Translate Usage: Updating state based on previous state

* Translate Usage: Removing unnecessary object dependencies

* Translate Usage: Removing unnecessary function dependencies

* Translate Usage: Reading the latest props and state from an Effect

* Translate Troubleshooting: My Effect runs twice

* Minor fix

* displaying-different-content-on-the-server-and-the-client

* Fix effect event translation

* Fix minor translation

* my-effect-runs-after-every-re-render

* my-effect-keeps-re-running-in-an-infinite-cycle

* Fix typos

* Fix hydration translations.

* my-cleanup-logic-runs-even-though-my-component-didnt-unmount

* my-effect-does-something-visual

* Fix casing

* Fix typos

* Fix casing

* Fix translations of setup function

* Apply suggestions from code review

Co-authored-by: Jakub Drozdek <[email protected]>

* Remove exclamation marks from code examples

* Fix rest of setup function translations

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Co-authored-by: Jakub Drozdek <[email protected]>