On 2015-11-30 14:11, Rasmus <rasmus@gmx.us> writes:

>> +  :group 'org-export-latex
>> +  :type '(repeat
>> +	  (list
>> +	   (symbol :tag "Language name                    ")
>> +	   (string :tag "Environment name or format string")))
>
> I don't know if the strings have to the same width, but I assume you
> tested it before hand.  For me at least this is the only way to evaluate
> Custom changes.

I assume it has to be the same size because it looks like this:

Hide org-latex-custom-lang-environments:
INS DEL List:
            Language name                    : nil
            Environment name or format string: 

I'll apply the patch.

Best,

Alan

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