Printing missing keys via tests about i18n_extension

[marcglasberg]

This is the recordKey function:

/// This simply records the given key as a missing translation with unknown locale.
String recordKey(String key) {
  if (Translations.recordMissingKeys)
    Translations.missingKeys.add(TranslatedString(locale: "", text: key));

  Translations.missingKeyCallback(key, "");

  return key;
}

As you can see above, the locale is defined as locale: ""

The reason is, it doesn't know the locale "Hello World" is supposed to be in. How could it know? I just knows there is some string for which a key was not defined.

Maybe a better error message would be:

➜ Translation key with unknown locale is missing: "Hello World".

Or, simply:

➜ Translation key is missing: "Hello World".

Of course, this is only the case when you are importing the default.i18n.dart file. When you create and import your own translations file, you can then define the locale. For example:

static var t = Translations("en_us") +
      { ... } 

And in this case it will output:

➜ Translation key in 'en_us' is missing: "Hello World".