Crowdin it's an online platform to translate applications and web pages.
The SuiteCRM translation project uses Crowdin to setup a collaborative translation environment. Here you can translate your language and download any language pack ready to install in SuiteCRM. All you need is a browser, no install, no setup.
If you are using Joomla you should also join and translate this project:
A1- Create an account with Crowdin (its free): https://crowdin.com
A2- Enter the project you want to translate (as in https://crowdin.com/project/suitecrmtranslations )
A3- Choose a language to join and ask to be a "translator".
A4- Wait for the approval
B1- Open your language
B2- Select a file to translate (or hit the "Translate All" button)
B3- Translate!