ascii code after migration just a code

After my migration to xenforo i noticed that a lot of 👍 and other ascii codes not transformed into the corresponding icons.

PHP:s setting "default_charset" is set to "utf-8'

What can i do to replace them to either the corresponding icon or just remove them?

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source https://xfworld.net/threads/ascii-code-after-migration-just-a-code.47871/