Ishvara understands every language, he needs only that it should be chanted with devotion, purity and surrender to Him.
BG 7.19 — After many births and deaths, he who is actually in knowledge surrenders unto Me, knowing Me to be the cause of all causes and all that is. Such a great soul is very rare.
BG 4.41 — One who acts in devotional service, renouncing the fruits of his actions, and whose doubts have been destroyed by transcendental knowledge, is situated factually in the self. Thus he is not bound by the reactions of work, O conqueror of riches.
BG 6.47 — And of all yogīs, the one with great faith who always abides in Me, thinks of Me within himself and renders transcendental loving service to Me – he is the most intimately united with Me in yoga and is the highest of all. That is My opinion.
BG 7.23 — Men of small intelligence worship the demigods, and their fruits are limited and temporary. Those who worship the demigods go to the planets of the demigods, but My devotees ultimately reach My supreme planet.
BG 8.28 — A person who accepts the path of devotional service is not bereft of the results derived from studying the Vedas, performing sacriﬁces, undergoing austerities, giving charity or pursuing philosophical and fruitive activities. Simply by performing devotional service, he attains all these, and at the end he reaches the supreme eternal abode.
BG 12.6-7 — But those who worship Me, giving up all their activities unto Me and being devoted to Me without deviation, engaged in devotional service and always meditating upon Me, having ﬁxed their minds upon Me, O son of Pṛthā – for them I am the swift deliverer from the ocean of birth and death.
BG 12.16 — My devotee who is not dependent on the ordinary course of activities, who is pure, expert, without cares, free from all pains, and not striving for some result, is very dear to Me.
BG 18.55 — One can understand Me as I am, as the Supreme Personality of Godhead, only by devotional service. And when one is in full consciousness of Me by such devotion, he can enter into the kingdom of God.
BG 18.64 — Because you are My very dear friend, I am speaking to you My supreme instruction, the most conﬁdential knowledge of all. Hear this from Me, for it is for your beneﬁt.
BG 18.65 — Always think of Me, become My devotee, worship Me and offer your homage unto Me. Thus you will come to Me without fail. I promise you this because you are My very dear friend.
BG 18.66 — Abandon all varieties of religion and just surrender unto Me. I shall deliver you from all sinful reactions. Do not fear.
God just needs devotional love and purity and fixing up of devotee's mind upon Him; and then the devotee's prayer(and mantras)/homage shall reach upto him.