.htaccess

<IfModule mod_rewrite.c>
    RewriteEngine on

    # If the hostname is mineriailegal.amazoniasocioambiental.org
    RewriteCond %{HTTP_HOST} ^mineriailegal\.amazoniasocioambiental\.org$
    RewriteCond %{QUERY_STRING} !(^|&)lang=es($|&)
    # 301 redirect to the same resource on mineriailegal.amazoniasocioambiental.org
    RewriteRule ^ https://mineriailegal.amazoniasocioambiental.org%{REQUEST_URI}?lang=es [R=301,L,NE]

    # If the hostname is illegalmining.amazoniasocioambiental.org
    RewriteCond %{HTTP_HOST} ^illegalmining\.amazoniasocioambiental\.org$
    RewriteCond %{QUERY_STRING} !(^|&)lang=en($|&)
    # 301 redirect to the same resource on illegalmining.amazoniasocioambiental.org
    RewriteRule ^ https://illegalmining.amazoniasocioambiental.org%{REQUEST_URI}?lang=en [R=301,L,NE]

    # If the hostname is garimpoilegal.amazoniasocioambiental.org
    RewriteCond %{HTTP_HOST} ^garimpoilegal\.amazoniasocioambiental\.org$
    RewriteCond %{QUERY_STRING} !(^|&)lang=pt($|&)
    # 301 redirect to the same resource on garimpoilegal.amazoniasocioambiental.org
    RewriteRule ^ https://garimpoilegal.amazoniasocioambiental.org%{REQUEST_URI}?lang=pt [R=301,L,NE]

    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /index.html [L]
 </IfModule>