Question

which feature of old english poetry did thus modern translation maintain?

Answer 1

They both use Alliteration in old english poetry and modern translation

Answer 2

The alliteration is the feature of old english poetry did thus modern translation  maintain.

The alliteration is the conspicuous repetition of identical initial consonant sounds in successive or closely associated syllables within a group of words even spelled differently.

Alliteration is from latin word littera meaning " letter of the alphabet".