Microsoft word: don't expose a language for format changes that only contains whiteps...

Microsoft word: don't expose a language for format changes that only contains whitepsace. This is mostly needed as MS Word only marks east-asian characters (not whitespace) as an asian language, and it falls back to english US or another european langage for whitepsace. Now all whitespace has no language and therefore NVDA uses the synth or interface language. A fix for #2047