Simply put...
Summaries are in English by default but this can be changed.
Transcripts are generated in one of 35 languages. Based on your settings and the most spoken language in a meeting, Wudpecker chooses which language to use for the transcript. The transcript language can also be modified later.
Ask Wudpecker can understand and communicate back in basically any language that modern AI understands.
For more information, read more in-depth articles about language here.