Since modern Chrome doesn't have a manual encoding menu, you can try an extension like the Charset tool to force the page to render in UTF-8.
Tools like the Universal Online Cyrillic Decoder or 2cyr.com are designed specifically for this. You can paste the "gibberish" there, and it will attempt to cycle through different encodings to find the original readable text. Change Browser/App Encoding: Since modern Chrome doesn't have a manual encoding
If this was an email, you can often fix it by going to Actions > Other Actions > Encoding and selecting Unicode (UTF-8) . Since modern Chrome doesn't have a manual encoding
Encoding settings for garbled text - Google Merchant Center Help Since modern Chrome doesn't have a manual encoding