I'm running Kdenlive 0.9.10 on Kubuntu 14.10 with KDE 4.14.1 and Kdenlive's language is a mixture of Spanish and English, while it's not a problem for me it may be for others and I am wondering how can I contribute to the Translation, I've searched on the Internet but I found nothing, where are the spanish translators?

Hello,
Thanks for your offer ;
As Kdenlive is now part of KDE, you should contact the spanish KDE translation team to get involved and synchronize on Kdenlive item.
Enjoy translating