Yes you can translate language manually.

Steps:

1- Login to your admin panel 

2- Left menu Click on  Settings -> Languages

3- Click on "Available Languages" at the top

4- Under "Active languages" you will see English , hover your mouse on it then Click on "CLONE"

5- Clone Language pop up box will popup, complete it as with language name and language ISO tag. Once you are done, Click on "Activate" for the new language that you have cloned.

6- Go to your website root directory and go to \ow_pluginfiles\base

You will find file named :  lang_1.php   this is your original English language file (don't touch it)

You will also find other file(s) for the new language that you have cloned. e.g. lang_10.php

7-Open that file lang_10.php with Notepad++ software , download it from here

it is very import to use Notepad++ because it allows you to save files in UTF-8

8- After opening your file in Notepad++ Click on "Encoding" from the top menu then choose "Encode in UTF-8 without BOM"   This is very important.

9- do your changes directly to that file and you are done.

Method 2:

Follow above steps from 1 to 5

Look at the top of the page and click on "Edit Language" 

Underneath it should say "You are editing" English  ==> change it to the new language and start search for what you want to edit and edit it from admin panel

I personally prefer Method 1 because it is fast and quick

Thank you

check this post: http://www.oxwall.org/forum/topic/39093

please do the search before posting anything on the forum

Yes, method 1  is fast and quick. But there is no original reference language (English). In admin page, you can do translation job with reference. So it is better to choose the ways depend on the situation.

Anyway, I know the ways to do it! Thanks a lot!

If no this answer, I even try to study the xml files.