Fix data encoding only for content-type in "text/html; charset=UTF-8"

[StephSako]

Some requests have a different header than others, whose data must be correctly encoded

[alamirault]

Do you have an endpoint example ?

I will add unit test in order to cover this case

[StephSako]

Routes with content-type : "text/html; charset=UTF-8" and accents bugging ("é" into "Sé", "à" into "Ã", "ç" into "ç", ...) :

• xml_partie_mysql.php?[...]&licence=9536212 (search for LE MORVAN's firstname)
• xml_new_actu.php
• xml_liste_joueur.php?[...]&nom=le morvan

Routes with content-type : "application/xml;charset=ISO-8859-1" and accents or special chars not bugging, and their data must not be encoded. If some special chars or accents are encoded, they turned into the "?" char. Examples :

• xml_partie.php?[...]&numlic=9536212 (search for LE MORVAN's firstname)
• for the "°" char : xml_result_equ.php?[...]&cx_poule=440318&D1=107787&organisme_pere=1 (if has encoding, "Poule 3 - tour n°2 du 08/10/2022" turn into "Poule 3 - tour n?2 du 08/10/2022")

[alamirault]

Thank you @StephSako

I added unit tests, and this fix explains a strange behavior I had noticed