l10n: add font for Japanese

static/font/PixelMPlus/LICENSE_E

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+M+ FONTS                                Copyright (C) 2002-2013 M+ FONTS PROJECT
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+LICENSE_E
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+These fonts are free software.
+Unlimited permission is granted to use, copy, and distribute them, with
+or without modification, either commercially or noncommercially.
+THESE FONTS ARE PROVIDED "AS IS" WITHOUT WARRANTY.
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+http://mplus-fonts.sourceforge.jp/mplus-outline-fonts/