Generally within a branch (x.X), the patch should work. However, the patches reflect code based on the previous version (1.4.7) and are really only "designed" for that version (or checked against it). In this case, you are likely ok but it's not necessarily something we could guarantee.
There are two issues. One is specific to notices; this one is rather specific in requirements. The other is not specific to any one area and could theoretically happen in various places (though relatively few are user controlled).
I would recommend patching over not doing anything, though I would recommend upgrading over either if you're not currently on 1.4.7.
What should I edit of these files? I've simply downloaded the patch .zip, extracted the files on my PC, uploaded and overwrote the three to the existing ones.
Edit: Maybe you meant to download the files I've on the server, copy the code from the downloaded files, and upload them? Isn't useless and longer than what I did?
Sorry but I'm not English.
Thanks for the reply.