HH Dalai Lama has said that for individual practice, it is better to use an English text.
A friend of mine actually knows HHDL's sister in India. His sister asked my friend for an English copy of the Six Session Guru Yoga as she had told HH she found it easier to understand Buddhist terminology in English than in Tibetan. So that gives some indication of how flexible HH is on this topic.
A foolish man proclaims his qualifications,
A wise man keeps them secret within.
A straw floats on the surface of water,
But a precious gem placed upon it sinks to the depths