[PATCH] po: Update Sinhala translation.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=46738

Your paranoid android.


=== debian9 (build log) ===

Makefile:273: recipe for target 'si.mo' failed
Makefile:8652: recipe for target 'po' failed
Task: The win32 build failed

=== debian9 (build log) ===

Makefile:273: recipe for target 'si.mo' failed
Makefile:8375: recipe for target 'po' failed
Task: The wow64 build failed