Add final newline to locale files (#2890)

.editorconfig

app/javascript/mastodon/locales/bg.json

app/javascript/mastodon/locales/de.json

app/javascript/mastodon/locales/en.json

app/javascript/mastodon/locales/eo.json

app/javascript/mastodon/locales/es.json

app/javascript/mastodon/locales/fa.json

app/javascript/mastodon/locales/fi.json

app/javascript/mastodon/locales/fr.json

app/javascript/mastodon/locales/he.json

app/javascript/mastodon/locales/hr.json

app/javascript/mastodon/locales/hu.json

app/javascript/mastodon/locales/id.json

app/javascript/mastodon/locales/io.json

app/javascript/mastodon/locales/it.json

app/javascript/mastodon/locales/ja.json

app/javascript/mastodon/locales/nl.json

app/javascript/mastodon/locales/no.json

app/javascript/mastodon/locales/oc.json

app/javascript/mastodon/locales/pl.json