A simple country selector web component using the paper-dropdown-menu that implements the app-localize-behavior and can translate the country names. Currently it supports localized country names for 253 languages. The country list is based on umpirsky/country-list.
<country-select></country-select>
<country-select language="de" label="Land"></country-select>
To build include the country list data files in your polymer.json.
"extraDependencies": [
"bower_components/country-list/data/**/*.json"
]