[I18N] remove website_forum_doc

.tx/config

addons/website_forum_doc/i18n/ar.po

addons/website_forum_doc/i18n/cs.po

addons/website_forum_doc/i18n/de.po

addons/website_forum_doc/i18n/el.po

addons/website_forum_doc/i18n/es.po

addons/website_forum_doc/i18n/fa.po

addons/website_forum_doc/i18n/fi.po

addons/website_forum_doc/i18n/fr.po

addons/website_forum_doc/i18n/gu.po

addons/website_forum_doc/i18n/it.po

addons/website_forum_doc/i18n/km.po

addons/website_forum_doc/i18n/mn.po

addons/website_forum_doc/i18n/nb.po

addons/website_forum_doc/i18n/nl.po

addons/website_forum_doc/i18n/pl.po

addons/website_forum_doc/i18n/pt_BR.po

addons/website_forum_doc/i18n/ro.po

addons/website_forum_doc/i18n/ru.po

addons/website_forum_doc/i18n/sr.po