Hi @perrinechaissac,
What would you like to translate?
1. The code of the Block Lab plugin, like https://cldup.com/UVWGBFyK_7.png
2. Block content from Block Lab blocks. For example, if you use Block Lab to create a hero block with the text ‘Learn more,’ translate that text.
3. Both
For number 1, it’s possible to translate the Block Lab code using Loco Translate, as you mentioned.
But I think that plugin won’t help for number 2 above, the content of the blocks.
For example, here’s the Loco Translate UI:
https://cldup.com/lmxtUQvEw6.png
For number 2 above, I haven’t tested WPML. It’s a premium plugin, requiring an $80 license for block translation.
Block Lab saves block content the same way any other dynamic block does, in the post content as attributes.
So I can’t think of a reason why WPML wouldn’t work with BL. I just can’t say, because I haven’t tested it.
Have a great weekend, and thanks a lot for bringing this up.