Allow Searching for Synonyms

[rsommerfeld]

When trying to find something, it is hard to come up with the exact specific term. Thus, it would be great if synonyms would also influence the search results.

Pre-Context:

• There is a rails library for synonyms: https://ersonukr.blogspot.com/2017/07/get-synonyms-and-antonyms-of-word-in.html

Post-Context:

• Eventually one might want to maintain a list of HPI-specific synonyms of places or people.
• It would also be useful to consider typos in the future.

Acceptance Criteria:

• Searching for "Silent room" and "Quiet room" should lead to the same result
• The weightings of synonyms should be lower so that you don't get weird search results ("content" is apparently a synonym of "food")