[Closed] where is the textdomain of my theme ?

When the theme or plugin is created, the texts were wrapped in gettext calls. Each call includes two arguments – the string that needs to be translated and a second argument called the text-domain. This second argument identifies all the texts in the theme as belonging to it. This is the value you enter in the text domain field, so that WPML can load the translation file and assign it to the theme.

A gettext call looks something like this

<?php _e('string to be translated', 'text-domain'); ?>

can be used like this

<?php _e('string to be translated is put here', 'your_theme'); ?>

so what you have to do is to identify strings wrapped in a GetText function call and from there get the text domain.

in the above case your_theme is the text domain

Its a good thing you posted on their forum, as they created the theme, they should be in position to answer that, other than that, you don't need to know if you are going to do translations using WPML as opposed to using .mo files, all you have to do is to scan the theme for strings in
WPML->Theme and plugin localization.

but this way (wpml translation) i have to scrap any ready made translation in .mo files…

Not necessarily,
When scanning a theme for strings, you have an option to import .mo file translations,

.mo file translation for plugins will be used no matter the setting used.