Runar

No, you’ll be given the choice to make everyone accept the new policy or not, so you can easily just fix the spelling mistake. This also applies to the guidelines.

This help guide explains how you can change the default language from English:
In short: Navigate to Customization -> Languages in the AdminCP, and click the Edit icon next to the language you want to set. In the popup window that appear, check the Default Language option, and save the form.
Edit: You'll have to install the Romanian language pack first. Please read this guide for help with installation.

As @Marc Stridgen said, there are several plugins and applications available that provide this functionality. Here are two of them:
 

This help guide takes you through the steps for purchasing and adding new (official) applications to your community:
In the "Adding a newly purchased application" section you'll find information about how to download and install the new application.

The badge is shown on the Reputation tab on a member's profile page, in the upper left corner below the number of reputation points received:

Edit: Maybe this help guide should be updated to include where the badge/image is shown?

Bonjour !
You can delete the test forum from your admin area (ACP). Go to Community and to Forums, then find the test forum and click on the drop down menu to find Delete.
Bonne chance, et bonne journée !