translate read more button gk tabs

hello,
i have a multilingual site, english-spanish,
and i have to translate the read more button on gk tabs in home page.
i created a spanish version for the file en-En.mod_tabs_gk4.ini ( es-Es.mod_tabs_gk4.ini)
and added this line : MOD_TABS_GK4_READMORE="Leer Más"
but it's not working,
any idea on what is the correct parameter to show the read more button in spanish?
thanks in advance and best regards,

i just solved by adding an override rule under Extensions->Language Manager-> Overrides and adding Constant: MOD_NEWS_PRO_GK4_NSP_READMORE and the desired text.
it worked

Thank you, yes, it`s work