The best alternatives to traduora are LocaleData, PhraseApp, and Aligner. If these 3 options don't work for you, we've listed a few more alternatives below.
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General Collaboration— One inbox for all your work discussions
LocaleData is a simple translation management platform for Ruby on Rails apps that helps you work on your YAML translation files even with your non-technical teammates. Upload your existing project translations, invite your translators, export the results.
We are excited to invite all to our Beta. Aligner is a great tool for product managers, support folks and anybody else who manage content in multiple languages to enjoy stress free editing and deliver new pieces of translations. Updating content in over 100 languages is not impossible anymore.
LanguageBot allows international teams & foreign language speaking workers to communicate directly within Slack using /slash commands to translate between languages. Your team can start testing free with 5000 translation credits. Instant, accurate and context aware - Slack button: https://languagebot.io
Lokapp is a collaborative tool developed for teams to manage the translations of all mobile and web projects. Lokapp is an open source platform which aims to automate the generation of translation files in an easier and more efficient way.