I have a twig file and a yml, in which I define the variables for translation
e.g.:
YML File -
variable.for.translation: Disponible
You were going on right track, what you missed is just to pass someVariable
as a parameter to trans() in your Twig file as:
<h2>{{ "follow.us.in.twitter"|trans({'%someVariable%': someVariable}, "workend") }}</h2>
Now your message in Yml file should be as:
follow.us.in.twitter: Hola, Follow %someVariable% en Twitter
This should work. For more details and clarity you can refer the following: Symfony Book
Good Luck.