Languages after update to v.1.5.6.x

Im running Version 1.5.5.1

if I update to OC v.1.5.6.x, would all languages and default settings still be as they are today, if I follow copy paste video of all files, and just keep old config file

same with my default Danish languages on opencart admin site.. would it still be Danish?

I would strongly advise you, to keep your Hands of your running Shop, better create a fully working Software Copy on the server, as well as a Server-Copy of the DB.

Then, you need to 'refurbish' the DB, to match OC 1.5.6.4. Check on those two Extensions, mentioned below, to make sure, that your DB will be upgraded correctly.

Two Sample Support Links, but there are more, but the one below specifically for upgrades to latest v.1.5.6._rc !!
Opencart Migration & Remote Upgrade Tool
http://www.opencart.com/index.php?route ... n_id=24347
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OC Upgrade Service 1.5.x Latest 1.5..x
http://www.opencart.com/index.php?route ... n_id=21579
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Regarding the language, just download a language Editor, install it into the new 1.5.6.4, and add possibly still missing words.
Magic Translations - OpenCart Language Translator Tool FREE
http://www.opencart.com/index.php?route ... n_id=24320
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Database Language Editor PRO FREE
http://www.opencart.com/index.php?route ... ion_id=922
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Good Luck
Ernie