Steam filters profanity and insults by default both in Steam chat and in games that support the filter. If you want to disable the chat filter, you can. You can even add your own personal word list that you want to filter.

This setting is available on your Steam account preferences page. To access it, click on name in the upper right corner of the Steam window and select “Store Preferences.”

Scroll down to the “Community Content Preferences” section. The options in the “Chat Filtering” section control the filter on Steam chats.
If you want to disable the filter, select “Do not filter strong profanity or slurs” in the “Language Preferences” section. You can also select “Allow strong profanity, but filter slurs.”
The default option is “Filter strong profanity and slurs with “♥♥♥” or “***”.

By default, the “Do not filter text from my Steam Friends” option is enabled. Steam will not filter offensive words that your friends send in messages. You can uncheck this box if you prefer Steam to apply this filtering to messages .
In the “Additional Custom Filtered Words” section, you can fully customize the filter. To have Steam filter any other word you want, type it in the “Always filter these words” box and click “Add”. To make sure Steam never filters a specific word, type it in the “Never filter these words” box and click “add”.
You can also download the lists as text files by clicking the “Download” button or upload a list of words from a text file by clicking the “Upload” button.

When you're done, you can simply leave the Preferences page. You don't need to click the "Save" button. Steam will immediately apply changes .
