It is possible to get a search engine that allow these request model with options:
->Langage: eg French / English / …
->Date of the project: eg started new 3 months / 6 month / more
+Set alerts when a new project with your langage is available
According to your request, I would like to mention that maybe the Transifex’s Task management is suitable for your case.
As far as the alerts we already have a pre-build notification system for this.
More information can be found here.
Please let me know if this answer is helpful to you.
Have a nice day!