User blog comment:HunterxPhantom/Translation of song needed/@comment-26871067-20161019101240

Taking a crack at it:

誇り高き悲しみ　別れと出会いの先

A proud sorrow, ahead of meetings and partings

ただ時は過ぎ行けど　尚、繰り返される過ち

With time simply passing by, it seems mistakes are being repeated

静かに語りかける　先人達の叫び

Speaking quietly, the cries of my ancestors

音もなくこだまする　息潜め時を待つ花のように

A soundless echo, a flower waiting to hold its breath

遺志を継ぐ者に託された　歴史の光と闇

Entrusted to the one who inherited their will, history's light and darkness

眼差しの裏側に秘めた　願い

Hidden behind their gaze, a wish

赤く　赤く　赤く　燃え盛る

Scarlet, scarlet, scarlet burning fiercely

証　決して　決して　絶やさぬように

A testament, never, never to fade

この憤り宿した　緋の瞳に誓おう

Harboring this resentment, I swear on these scarlet eyes

救い難き苦しみ　無念と散る魂

Salvation, hardship, suffering - souls falling in regret

分かち合い　讃えよう　尚、気高く残る輝き

Sharing and praising their continued noble shine

内に秘めた感情　抑えきれぬ敵情

Feelings hidden deep within, I cannot control unexpected pity for my enemy (I don't trust the accuracy of this translation, the line's pretty vague to me? It may be "I cannot control my enemy's unexpected pity".)

届きそうで　届かない　寄せては返す　さざ波のように

Almost within reach, and yet I can't reach it, a requested return like ripples in water

罪深き者に課せられた　償いきれぬ未来

Imposed on the sinners, a future of atonement unexpectedly cut short

胸の奥　深く刻まれた決意

Determination carved deeply into my heart

赤く　赤く　赤く　燃え盛る

Scarlet, scarlet, scarlet burning fiercely

視線　決して　決して　逸らさぬように

So I may never, never avert my gaze

この祈り宿した　緋の瞳を永久に

Harboring this prayer that the scarlet eyes will be eternal

散らばる無数の瞳　絡まるクモの糸

The countless eyes were scattered, tangled within the spider's threads

尊き命の救いの為なら　私の果てなど惜しくない

If it's for the sake of saving precious lives, I'll disregard my limits

熱く　熱く　熱く　燃え滾る

Hotly, hotly, hotly overflowing with fire

想い　決して　決して　褪せぬように

My feelings, never, never to fade

赤く　赤く　赤く　燃え盛る

Scarlet, scarlet, scarlet burning fiercely

証　決して　決して　絶やさぬように

A testament, never, never to fade

この祈り宿した　緋の瞳に誓おう

Harboring this prayer, I swear upon these scarlet eyes

It's 6am where I am, so I don't know why I've chosen now to translate something. I'll look it over again later for sure though.