URL size limited by uwsgi in certain deployments

[PascalRepond]

Bug description:

With certain very long queries, the server returns an error in sonar, sonar-test, bib-prod. Example: https://sonar.ch/global/search/documents?q=%22bonnesfontaines%22%20%7C%20%22petites%20familles%22%20%7C%20%22pramont%22%20%7C%20%22centre%20%C3%A9ducatif%22%20%7C%20%22fondation%20borel%22%20%7C%20%22l%C3%A9chaires%22%20%7C%20%22sombaille%20jeunesse%22%20%7C%20%22cit%C3%A9%20printemps%22%20%7C%20%22enfant%20c%E2%80%99est%20la%20vie%22%20%7C%20%22la%20clairi%C3%A8re%22%20%7C%20%22fondation%20officielle%20de%20la%20jeunesse%22%20%7C%20%22institut%20saint-raphael%22%20%7C%20%22placement%20d%E2%80%99enfants%22%20%7C%20%22la%20chaloupe%22%20%7C%20%22la%20fontanelle%22%20%7C%20%22placements%20forc%C3%A9s%22%20%7C%20%22enfants%20plac%C3%A9s%22%20%7C%20%22internement%20administratif%22%20%7C%20%22placement%20ferm%C3%A9%22%20%7C%20%22jeunes%20en%20difficult%C3%A9%22%20%7C%20%22unit%C3%A9%20de%20soins%20psychiatriques%20ferm%C3%A9e%20pour%20mineurs%22%20%7C%20%22fondation%20petitma%C3%AEtre%22%20%7C%20%22billodes%22%20%7C%20foyer*%20%7C%20fugue*%20%7C%20%22internat%22%20%7C%20%22internats%22%20%7C%20serix%20%7C%20%22care%20leavers%22%20%7C%20%22Szilassy%22%20%7C%20%22institut%20st-germain%22

This is due to an unset buffer-size variable in uwsgi. We should standardise this variable for all servers.

Expected behavior:

• Even a query of 1000 characters should not return an error.
• Ideally, if this error occurs, a message should be provided to the user to inform them that the URL is too long.