if you create a "patch" please mark the pach as patch then too, and not as a standalone addon!
You can do so by going to the original addon and then click on the "optional patch" link (if it's enabled):
-> I've changed that here at the patch now for you
And why don't you contact the original addon author and let it include the /lang/br.lua file directly into the main addon (it even already contains a br.lua file, so you just need to update it if any translations are wrong?), insetad of creating new patch files
Thanks for considering to include language files always directly into the addon, instead of creating patches.