This is a .yaml to .po converter. It works works both ways.
I've made it because I was using POEditor.com for the translation management of my mobile apps and I needed to use it for a Rails app as well. It's a really nice app and I didn't want to use yet another just for .yaml files. Since POEditor doesn't support .yaml files at this time, I use this converter to translate them to .po and manage their translation.
After the translation is done, I export the .po files, run them through this converter and use the resulting .yaml files.
I thought someone might find it useful so I set it up online.
I'm sure it's not perfect, but I'm willing to maintain it if I get feedback at hi@yml2po.com.