translate buttons

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Dear all,

I am new to concrete5 and am trying to create a single-language (dutch) website. I am using the Grandeur theme as well.

Some of the buttons on the website (i.e. "send email" and the text stating "read more") are not possible to change. I have therefore been looking into the translation possibility.

I have downloaded the translation file from Transifex (.po) and created a .mo-file. I added this in the corresponding folder (nl_NL/LC_MESSAGES). Now the backend/cms has been translated. However, if I go into the languages option within System&Settings, I cannot choose the Dutch language from the dropdown menu. Instead the mouse changes into a kind of "Stop-sign" when I mouseover the dropdown. (same happens when I use a version of the translation I found on this site from 2010)

Needless to say, the text in the frontend has not been changed.

Can anyone tell me what I am doing wrong & why I cannot choose the language file in the backend? I would also be grateful if someone could tell me how to change the button text down&dirty (hard-code). I am not looking for a multilingual website, just to change those texts/buttons.

Thanks a million in advance for any help you could provide.

Kind regards,
DMR