<...>
-snip-My sincere thanks again, for finding a needle in a haystack
-snip-
-Edit-
After I checked again, it turned out that the sentence between the subtitles 'Entendiendo PGP' and 'Empezamos' still didn't appear.
The error was in the word 'Advertencia' and not just in BBCode, so I got around it by adding random code between the letters.
Code:
[size=13pt][color=red]Ad[u][/u]vertencia: No compartas tu clave privada ni tu contraseña con nadie.[/color][/size]
Thank you again Husna QA!
I have edited it again.
As you said, the /size code was integrated with the one in front of "Before" so that shouldn't be the cause of the problem. But it is also a mystery why the word "Advertencia" caused it. In any case, I think that after the last change you mentioned the translation is displayed correctly.