Yes I can explain. Perhaps my wording was wrong, I tend to type and not get the things in the correct order so if the reader does not understand what I am talking about then they didn't get the message I was trying to impart.
I first was aware of this when Moodle 2.0 was being developed, and the first theme to be created, other than BASE and STANDARD, was made by New School Learning, which was called CANVAS.
I worked for New School Learning for a year or so at this time when the problems with Language files first came to light.
Anyway the problem of HTML and other coding in Language files is still a problem if you like it or not.
If you want to know more about this, then I suggest you ask David Mudrak - https://github.com/mudrd8mz as he is has worries about this subject especially with the translations. Any small mistake can upset the balance of what the user sees.
Also the fact that the mistake with the spacing in the ERROR, that this discussion is all about, goes to show that we are all human and can make mistakes in error or intentionally.
Hope this clears the air in this matter?