First of all it would help to know to which version of ZC this editor is being installed. Second what editor package was tried? (Ie, from where did it come?)

As to renaming, there is no need to rename the editor file(s) for a "bkeditor" as if nothing else the next time it needs to be updated, the same modification will be necessary or the previous removed...

Regarding placing in a language directory, then will need to 1) apply an editor (which is already pretty much language free) to each available language and 2) may still need a base file (location directed to install).

As to the all caps, yes that is an indicator typically used to denote the need to replace that text with the appropriate text that is typically all lowercase.

The editorhandlerfilename.php content should be replaced with the filename that handles the editor. In a ckedtor package provided in the plugins of this site for ZC, such an additional fileset should already contain the necessary file handler and associated files to address this issue.

In most cases the problem with installing the editor comes from incorrect placement of the files. The next is the adjustment in the admin configuration my store area to indicate the use of an html editor...