Search (in admin) does not work if keyword smaller than 3 chars

Describe the bug

When searching for podcast episodes in the podcast admin page, the search does not return anything if the keyword is 1 or 2 characters. This could be an expected behaviour, but it is not explicit

Steps to reproduce

0. Have podcast episodes and go to the episode list
1. Search for a two-letter word

Expected behavior

A list of episodes containing this two-letter word, or a message saying that we can't search for words smaller than 3 letters, either before or after the search.

Actual behavior

No result found.

Relevant logs and/or screenshots

(ar go in breton means: the yeast)

Context

• Castopod: v1.0.0-beta.19
• OS: Debian
• Browser: Firefox
• Web server: Nginx (behind Traefik reverse-proxy and through Docker)

Possible fixes

• allow for 1 or 2-letter keyword searches
• explicitly disallow it