Whitby's instructions are missing a step. You need to edit osso-cities.mo in /usr/share/local/en_GB/LC_MESSAGES/ (adjust for your locale) to add the city. You can do it without using poEdit, but you still need msgunfmt and msgfmt. I had them on my Linux box, but I don't know if they are available for Windows.

1. Copy osso-cities.mo from the tablet to a Linux box
2. Run "msgunfmt osso-cities.mo -o osso-cities.po"
3. Edit osso-cities.po with any text editor. Add the following lines, with blank lines separating the from other pairs:

msgid "osso_db_city_toronto"
msgstr "Toronto"

4. Run "msgfmt osso-cities.po -o osso-cities.mo
5. Copy osso-cities.mo back to your tablet.