The terminology of the boolean_button is translated with

_t(opt_terms.string_true)

which can work only if the variable content is already present in the
translation map.
This commit adds js files that do nothing but add the terms in the
translation map. This way it will be exported by babel js export and
the translation will be loaded by the web client

Closes odoo/odoo#34774

closes odoo/odoo#34954

Signed-off-by: VincentSchippefilt <VincentSchippefilt@users.noreply.github.com>