This commit slightly adapts the invisible attrs domain of the is_youtube_replay field to account for empty OR False youtube_video_url values. So that the youtube replay field is always hidden if no youtube URL is configured. Side note: The web client should probably consider empty as a Falsy value so that we can write simpler attrs domain based on empty/False Char values. We also took this opportunity to tweak some youtube field labels. Task-2643205 closes odoo/odoo#76303 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>