hi the po / mo files included in the respectibe folder/ languages folder in theme and plugins folder . 

you can find es_ES.po es_ES.mo file . 

also you can trnaslate by yourself : 

Please refer this tip : 

https://wplms.io/support/knowledge-base/translate-using-loco-translate-plugin/

transalte the wplms theme to translate the login text in header and for other translate vibebp plugin .

also 

hi to translate that : 

1 . in loco translate  : 

make sure you have increased the file size from here:

https://prnt.sc/21jy4pq

https://prnt.sc/21jydo6

increase it to 1500K

        a sync the template file : https://wplms.io/support/knowledge-base/translate-using-loco-translate-plugin/#translatefive

          b then at last sync the po file : https://screencast-o-matic.com/watch/c36UiPVuO54