Use the whole module name for SentencesParser

In order for `include SentencesParser` to work with Zeitwerk, we'd have
to change the code slightly, so it follows Ruby conventions to resolve
constants:

```
module RemoteTranslations::Microsoft
  class Client
    include SentencesParser

    # (...)
  end
end
```

This would mean changing the indentation of the whole file. While we can
do that, changing the indentation of a file makes it harder to use
commands like `git blame` or `git log` with the file, so we're doing the
change the easy way.

app/lib/remote_translations/microsoft/client.rb

@@ -1,5 +1,5 @@
 class RemoteTranslations::Microsoft::Client
-  include SentencesParser
+  include RemoteTranslations::Microsoft::SentencesParser
   CHARACTERS_LIMIT_PER_REQUEST = 5000
   PREVENTING_TRANSLATION_KEY = "notranslate".freeze