[skip ci] Update .po files

Autobuild bot on TravisCI · Autobuild bot on TravisCI · commit 6873cb8f0b3a · 2019-02-05T10:33:45.000+09:00
diff --git a/library/decimal.po b/library/decimal.po
@@ -19,7 +19,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Python 3.7\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2019-01-01 10:14+0900\n"
+"POT-Creation-Date: 2019-02-03 10:33+0900\n"
 "PO-Revision-Date: 2017-02-16 23:06+0000\n"
 "Last-Translator: tomo, 2017\n"
 "Language-Team: Japanese (https://www.transifex.com/python-doc/teams/5390/ja/)\n"
@@ -2324,3 +2324,21 @@ msgid ""
 "Alternatively, inputs can be rounded upon creation using the "
 ":meth:`Context.create_decimal` method:"
 msgstr "もしくは、入力を :meth:`Context.create_decimal` を使って生成時に丸めてしまうこともできます:"
+
+#: ../../library/decimal.rst:2119
+msgid "Q. Is the CPython implementation fast for large numbers?"
+msgstr ""
+
+#: ../../library/decimal.rst:2121
+msgid ""
+"A. Yes.  In the CPython and PyPy3 implementations, the C/CFFI versions of "
+"the decimal module integrate the high speed `libmpdec "
+"<https://www.bytereef.org/mpdecimal/doc/libmpdec/index.html>`_ library for "
+"arbitrary precision correctly-rounded decimal floating point arithmetic. "
+"``libmpdec`` uses `Karatsuba multiplication "
+"<https://en.wikipedia.org/wiki/Karatsuba_algorithm>`_ for medium-sized "
+"numbers and the `Number Theoretic Transform "
+"<https://en.wikipedia.org/wiki/Discrete_Fourier_transform_(general)#Number-"
+"theoretic_transform>`_ for very large numbers.  However, to realize this "
+"performance gain, the context needs to be set for unrounded calculations."
+msgstr ""
