import discord

async def execute(bot, params, message):
    roles = params.get('roles', [])
    if not roles:
        # Fallback for single role
        roles = [params]
    guild = message.guild
    modified_count = 0
    for role_params in roles:
        role_name = role_params.get('role_name')
        new_name = role_params.get('new_name')
        role = discord.utils.find(lambda r: r.name.casefold() == role_name.casefold(), guild.roles)
        if not role:
            await message.channel.send(f"Rôle '{role_name}' introuvable.")
            continue
        try:
            await role.edit(name=new_name)
            modified_count += 1
        except discord.Forbidden:
            await message.channel.send(f"Je n'ai pas les permissions pour modifier le rôle '{role_name}'.")
    if modified_count > 0:
        await message.channel.send(f"{modified_count} rôle(s) modifié(s).")