[Merge] lp:~zctgbhu/plymouth/bug-1339954 into lp:ubuntu/plymouth

[zhangchao]

>  a) there is a smaller (and still good quality) font package
I didn't find smaller font，in the fonts that full support for Chinese.

>  b) if we can stop installing the current dejavu ttf file.
I simply compared the glyphs of dejavu and DroidSanFallback，DroidSanFallback is missing a lot of Latin glyphs than dejavu. So I think dejavu ttf still must be installed.
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https://code.launchpad.net/~zctgbhu/plymouth/bug-1339954/+merge/226236
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