Check Ministry of the Interior's 2018 list of flag days

[hugovk]

Check and update from http://intermin.fi/en/flag-and-arms/flag-flying-days/2018

[hugovk]

Also handy:

• https://twitter.com/Sisaministerio
• #liputus OR #liputuspäivä OR #liputan
• http://play.google.com/store/apps/details?id=fi.aniway.liputan
• https://www.jkauppi.fi/liputus/