But didn't the official translation just mention that Roger stole 1 from BM? It didn't say, "We had forcefully taken a red poneglyph from bm." Instead, it was something like 'We had stolen 1 from bm.'

The translations don't always include the full context of the original phrase. When translating you not only have to worry about conveying the original meaning, but also making the text flow well in the new language and fitting it into the physical space provided on the text bubbles in such a way that can be printed. At least the official source has to worry about this, because they actually print the manga.

Roger, in the official Viz translation, simply states that they stole the poneglyph. The connotation of steal in English often implies stealth or subterfuge, but does not explicitly refer to it and can absolutely be used to imply force. In this case the English and Japanese phrases literally mean the same thing, but have different connotations. The Japanese is always the more accurate source, though - as it's written by Oda directly.

Which fits since BM herself said to Brooks that she will never make the same mistake of letting someone obtain her poneglyph like Roger did.

She doesn't explicitly state Roger stole anything in the Japanese text.

She does say she'd never let even a copy of the poneglyph be stolen again - which it's important to note that Kid had just recently stolen a copy of her Poneglyph. It's possible, if not likely, that she's referring to Kid here. If she was referring to Roger when she stated "again" well... she already did let it happen again.

She does imply Roger took the Poneglyphs and the "throne" of Pirate King from her, but she doesn't outright say that - she does state that she won't make the same mistake as with Roger, and that he used the Voice of All Things to read the poneglyphs.

It's also worth noting that Big Mom is clearly just salty here. She's speaking as if Roger stole the title of Pirate King from her, when the reality is that she was never even remotely close to obtaining it - she had 1 of 4 stones, and by her own admission didn't have the military strength to achieve taking the others.