There is a phrase in Mormonism ‘as far as it is translated correctly’ which LDS will occasionally admit to in their beliefs regarding the King James Bible. Having spent time reading the Joseph Smith so called ‘translation’ of the King James Bible (written in king james english, btw), I am amused that his fabrications from whole cloth are considered a ‘better translation’ ... he neither read nor comprehended Greek, Aramaic, or Hebrew....
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It is correct the LDS accept the Bible to be the word of God as far as it is translated correctly. You are in error about how Joseph Smith went about in preparing his translation of the Bible. He did study Greek and German so he could better understand the Bible, by reading other versions of the Bible. There are many corrections that are from Smith’s translation of the Bible that are footnoted in the KJV published by the LDS church. Most of his corrections are simple spelling and grammatical errors or completion of thoughts. There are significant changes in certain areas and naturally, they agree more with LDS teachings than others since it is believed that plain and precious parts of the Bible were lost at one time.
There ya go!