Make sure XML feeds are always encoded in UTF-8

locale/translations.go

locale/translations/fr_FR.json

reader/feed/handler.go

reader/http/client.go

reader/http/response.go

reader/icon/finder.go

reader/subscription/finder.go

server/static/bin.go

server/static/css.go

server/static/js.go

server/template/common.go

server/template/views.go

sql/sql.go