It will be a little tough to get into translation business unless you have a portfolio.  I am a translator myself, and in the beginning it was very difficult to qualify for translation bounties.  However, there are a few ways I would suggest for you to try:

1)  Read this topic:  https://bitcointalk.org/index.php?topic=3085609.msg31821680#msg31821680
2)  Fill out the form & Register here:  https://docs.google.com/forms/d/1UXNpbPalIfVOgf3sXc9wAIRJP7HseOUju46pX8hwjHQ/viewform
3)  Find translation campaigns, either search on BCT Bounty threads or go to website such as: https://bountyplatform.io/
4)  Register for translation campaign there.  Explain to the bounty manager that you are know and doesn't have any portfolio.
5)  In lieu of portfolio, perhaps you can use your linked in profile.
6)  Try to contact ICOs directly and offer to do translations for free

P/S:  Please be advised that ICO translation is not just about the language, you must also be well-versed in terminology, technical terms, familiarity with Photoshop, manipulating images, BB codes etc..

Good luck.