[FIX] base_external_referentials: fix error message for decorator and fix method multi_lang_read
[FIX] base_external_referentials: fix error message for decorator and fix method multi_lang_read


brain-tec/connector,gurneyalex/connector,fevxie/connector,maljac/connector,maljac/connector,esousy/connector,BT-ojossen/connector,BT-jmichaud/connector,mohamedhagag/connector,brain-tec/connector,MindAndGo/connector,hugosantosred/connector,BT-jmichaud/connector,js-landoo/connector,fevxie/connector,Antiun/connector,open-synergy/connector,sylvain-garancher/connector,anybox/connector,brain-tec/connector,esousy/connector,guewen/connector,gurneyalex/connector,dvitme/connector,hugosantosred/connector,zhaohuaw/connector,acsone/connector,open-synergy/connector,acsone/connector,Endika/connector,dvitme/connector,mohamedhagag/connector,js-landoo/connector,zhaohuaw/connector,MindAndGo/connector,anybox/connector,acsone/connector,guewen/connector,BT-fgarbely/connector,Antiun/connector,BT-fgarbely/connector,sylvain-garancher/connector,Endika/connector,BT-ojossen/connector