StatCollector -> Translations

[stephan-gh]

StatCollector is more like an utility class for accessing the default translations, so it would be better called as something like Translations.

Together with #110 it would probably also make sense to move it together with StringTranslate to text or text.translation

[LexManos]

1.9:
net/minecraft/util/StatCollector -> net/minecraft/util/text/translation/I18n
net/minecraft/util/StringTranslate -> net/minecraft/util/text/translation/LanguageMap