translation french

Event Calendar WD version 1.1.41
WP 5.7.1
GeneratePress 3.0.3
FireFox 80.0

https://www.ccefr.fr/event_category/conference/
after a clic in the right column of page for
“Fait religieux dans le monde”

I want to translate the texte : “Event Category” in this page

to have
“Mot clé?:?Fait religieux dans le monde”
for
“Event Category : Fait religieux dans le monde”

+++++++++++++++

I found his CSS

<header>
………

<div id=”page” class=”site grid-container container hfeed”>
<div id=”content” class=”site-content”>

<div id=”primary” class=”content-area”>
<main id=”main” class=”site-main”>
<header class=”page-header”>

<h1 class=”page-title”>

Event Category?:
<span>Fait religieux dans le monde</span>
</h1>
</header>
+++++++++++++++

I try to modified CSS … without no effect to have ” Mot clé : Fait religieux dans le monde “… but change color, change font, etc

+++++++++++++++
I translate in french ALL terms of
event-calendar-wd-fr_FR.mo
and with care
all “Event Category”

I use my new
event-calendar-wd-fr_FR.mo
event-calendar-wd-fr_FR.po

++++++++++++++

NO SUCCES to change “Event Category : Fait religieux dans le monde” to have
” Mot clé?:?Fait religieux dans le monde ”

Or
to
display : none;
only for “Event Category”

Or
to color Event Category to … the background-color of the “page-title”

++++++++++++++

Please help me

French native speaking Apologise for my bad english

MANY THANKS

The page I need help with: [log in to see the link]