"English language is a living language."
Translation:Limba engleză este o limbă vie.
The first one is definite: limb
a [engleză] =
the [English] language, while the second one is indefinite: o limb
ă [vie] =
a [living] language.
This is the case with all feminine nouns ending in -ă: fată / fata, vacă / vaca, treabă / treaba, țară / țara...
The concept of definite and indefinite articulation of nouns is quite fundamental in Romanian. I would recommend getting familiar with it in the earliest stages possible.