Reported background pattern labels don't match with the patterns in Excel 2016

[leonardder]

NVDA reports Excel background patterns thanks to #3683. I've been looking into this to translate the patterns, and I noticed that the pattern names aren't in line with the names given in Excel 2016. For example:

• 12,5% gray is reported as background pattern gray16
• Reverse Diagonal Stripe is reported as background pattern down
• Thick Diagonal Crosshatch is reported as semigray75

Especially the latter two make absolutely no sense to me. Since #3683 is closed and included in 2016.2, I thought it would be best to report this in a new issue here.

[jcsteh]

@ManshulBelani, could you look into this please? CC @dineshkaushal.

[josephsl]

Reopening due to a major regression found:

@ManshulBelani, It seems background text is causing issues for translators, in that .po cannot be compiled into .mo.

Thanks.