[Talk-si] name:si tags

[Paul Norman]

Hello,

I've been doing some work with other language support with the default
osm.org stylesheet. During this, I happened to notice a number of name:si
tags in Slovenia. 

I just wanted to remind everyone that the second part of a name:xx is a
language code, not a country code. The language code si is for Sinhalese, a
language spoken in Sri Lanka. 

The language code sl is for Slovene, which is perhaps what people intended.