How to change wordpress theme-language (or individual phrases)

Hey, I encountered some problems with a theme, I am trying to set up for a friend. The theme is called Multipress, is from Momizat.

In trying to figure out the way to change the text in the "read more" link, I was advised to change the PO- and the MO files with a program called poedit.

I then tried to alter different language files in the wp-content/multipress/languages folder.   Here is what I did in multiple instances (with different sets of  PO- and MO-files):

1. With Filezilla I downloaded the PO-file, and put an .old extension on the files (the PO and Mo)  on the server.
2. I then opened the PO file with POedit, made the correction to the "read more" text, saved the new po file version and compiled an new corresponding mo-file. I then uploaded the new files back  to the languages folder.

This changed nothing. There were several sets of PO and MO-files in the folder, and I tried the above procedure with sevberal of them, including one called default.po (and .mo).
         

I then - on the basis on advice from the Momizat Support - proceeded to try a plugin called codestyling-localiation, which did not work.

The  main Question is of course: What is my mistake?

I suspect that I am  somehow  tampering with the wrong files. So one way to reframe the question is

which files are the right ones?

or

Is there a way a setting somewhere that points to the files being used (so I can now which one to change, or change the setting)?

All the best
Lars PlougOwnerAsked:
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James RodgersWeb Applications DeveloperCommented:
add this toy your wp_config.php  file
define ('WPLANG', 'fr_FR');


replace fr_FR with the appropriate MO language file designation without teh file extension.
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Lars PlougOwnerAuthor Commented:
Hey, Sorry for my late response. I've been ill over Christmas and New Year. Thanks for your help, which - according to other research on the net - should solve the problem. But it doesn't. I'll try to formulate another question. All the best, MMH
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