add support for the go standard embed tag for locale files

_examples/i18n/template-embedded/locales/el-GR/other.ini

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+[nav]
+User = Λογαριασμός
+
+[debug]
+Title = Μενού προγραμματιστή
+AccessLog = Πρόσβαση στο αρχείο καταγραφής
+AccessLogClear = Καθαρισμός {{tr "debug.AccessLog"}}
+
+[user.connections]
+Title = {{tr "nav.User"}} Συνδέσεις

_examples/i18n/template-embedded/locales/el-GR/user.ini

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+[forms]
+member = μέλος
+register = Γίνε {{uppercase (tr "forms.member") }}
+registered = εγγεγραμμένοι

_examples/i18n/template-embedded/locales/en-US/other.ini

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+# just an example of some more nested keys,
+# see /other endpoint.
+[nav]
+User = Account
+
+[debug]
+Title = Developer Menu
+AccessLog = Access Log
+AccessLogClear = Clear {{tr "debug.AccessLog"}}
+
+[user.connections]
+Title = {{tr "nav.User"}} Connections

_examples/i18n/template-embedded/locales/en-US/user.ini

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+[forms]
+member = member
+register = Become a {{uppercase (tr "forms.member") }}
+registered = registered