done some translation

po/R-zh_CN.po

@@ -1796,66 +1796,83 @@ msgid "using"
 msgstr ""
 
 msgid "threads (see ?getDTthreads).  Latest news: r-datatable.com"
-msgstr ""
+msgstr "线程（请参阅?getDTthreads）。最新的消息：r-datatable.com"
 
 msgid "TRANSLATION CHECK"
-msgstr "中文"
+msgstr "翻译检查"
 
 msgid "**********"
-msgstr ""
+msgstr "**********"
 
 msgid ""
 "Running data.table in English; package support is available in English only. "
 "When searching for online help, be sure to also check for the English error "
 "message. This can be obtained by looking at the po/R-<locale>.po and po/"
 "<locale>.po files in the package source, where the native language and "
 "English error messages can be found side-by-side"
-msgstr ""
+msgstr "用英语运行data.table。软件包只提供英语支持。"
+"当在在线搜索帮助时，也要确保检查英语错误信息。"
+"这个可以通过查看软件包源文件中的po/R-<locale>.po和po/<locale>.po文件获得，"
+"这个文件可以并排找到母语和英语错误信息。"
 
 msgid ""
 "**********\n"
 "This development version of data.table was built more than 4 weeks ago. "
 "Please update: data.table::update.dev.pkg()\n"
 "**********"
-msgstr ""
+msgstr "**********"
+"这个data.table的开发版本是在4个多星期之前构建的。"
+"请更新版本：data.table::update.dev.pkg()\n"
+"**********"
 
 msgid ""
 "**********\n"
 "This installation of data.table has not detected OpenMP support. It should "
 "still work but in single-threaded mode."
-msgstr ""
+msgstr "**********\n"
+"data.table的安装未检测到OpenMP支持。"
+"在单线程模式下应该仍能运行"
 
 msgid ""
 "If this is a Mac, please ensure you are using R>=3.4.0 and have followed our "
 "Mac instructions here: https://github.com/Rdatatable/data.table/wiki/"
 "Installation."
-msgstr ""
+msgstr "如果是Mac，请确保您使用的R版本>=3.4.0，"
+"同时遵循了我们Mac上的安装说明：https://github.com/Rdatatable/data.table/wiki/Installation。"
+
 
 msgid ""
 "This warning message should not occur on Windows or Linux. If it does, "
 "please file a GitHub issue.\n"
 "**********"
-msgstr ""
+msgstr "在Windows或Linux上不应出现此警告消息。"
+"如果有，请提交给GitHub issue。\n"
+"**********"
+
 
 msgid ""
 "The option 'datatable.nomatch' is being used and is not set to the default "
 "NA. This option is still honored for now but will be deprecated in future. "
 "Please see NEWS for 1.12.4 for detailed information and motivation. To "
 "specify inner join, please specify `nomatch=NULL` explicitly in your calls "
 "rather than changing the default using this option."
-msgstr ""
+msgstr "这个选项'datatable.nomatch'正在被使用，没有被设置为默认值NA。"
+"该选项目前仍被使用，但在未来不会被使用。"
+"相关的详细信息和动机，请参阅1.12.4的信息。"
+"要指定内部连接，请在调用中明确指定`nomatch = NULL`，"
+"而不要使用此选项更改默认值。"
 
 msgid "The datatable."
-msgstr ""
+msgstr "datatable"
 
 msgid "version ("
-msgstr ""
+msgstr "版本("
 
 msgid ") does not match the package ("
-msgstr ""
+msgstr ")和包不匹配 ("
 
 msgid "). Please close all R sessions to release the old"
-msgstr ""
+msgstr ").请关闭所有R会话以释放旧版本"
 
 msgid ""
 "and reinstall data.table in a fresh R session. The root cause is that R's "
@@ -1867,57 +1884,69 @@ msgid ""
 "circumstances to 17478 to move the status to confirmed. This mismatch "
 "between R and C code can happen with any package not just data.table. It is "
 "just that data.table has added this check."
-msgstr ""
+msgstr "并在全新的R会话中重新安装data.table。"
+"根本原因是R包安装程序可能在某些未经确认的条件下将包置于显然可以正常工作的状态，"
+"但是新的R代码正在默默地调用旧的C代码："
+"https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17478。"
+"一旦安装包处于这不匹配的状态下，在您下次升级程序包之前，"
+"它可能会默默地产生错误的结果"
+"请提交具体的情况至17478协助我们确认这个Bug。"
+"R和C代码之间的这种不匹配可能发生在任何包中，而不仅仅是在data.table中。"
+"只是data.table添加了这个检查"
 
 msgid "This is R"
-msgstr ""
+msgstr "这是R"
 
 msgid "but data.table has been installed using R"
-msgstr ""
+msgstr "但是data.table安装在R"
 
 msgid ". The major version must match. Please reinstall data.table."
-msgstr ""
+msgstr "。主要的版本必须匹配。 请重新安装data.table"
 
 msgid ""
 "Option 'datatable.old.bywithoutby' has been removed as warned for 2 years. "
 "It is now ignored. Please use by=.EACHI instead and stop using this option."
-msgstr ""
+msgstr "选项'datatable.old.bywithoutby'已经被移除，警告了2年。"
+"它现在被忽略。 请改用by = .EACHI，然后停止使用这个选项。"
 
 msgid "Unexpected base R behaviour: list(x) has copied x"
-msgstr ""
+msgstr "意外的base R行为：list(x)已经复制了x"
 
 msgid "Unexpected base R behaviour: names<- has copied column contents"
-msgstr ""
+msgstr "意外的base R行为：names<- 已复制列内容"
 
 msgid ""
 "Unexpected base R behaviour: DF[2,2]<- did not copy column 2 which was "
 "assigned to"
-msgstr ""
+msgstr "意外的base R行为：DF[2,2]<- 没有复制第二列"
+"它被分配给"
 
 msgid ""
 "Unexpected base R behaviour: DF[2,2]<- copied the first column which was not "
 "assigned to, too"
-msgstr ""
+msgstr "意外的base R行为：DF[2,2]<-复制了第一列的内容，"
+"它也没有被分配给"
 
 msgid "Unexpected base R behaviour: DF[2,2]<- has not copied address(DF)"
-msgstr ""
+msgstr "意外的base R行为：DF[2,2]<- 还没有复制address(DF)"
 
 msgid ""
 "Reminder to data.table developers: don't use getRversion() internally. Add a "
 "behaviour test to .onLoad instead."
-msgstr ""
+msgstr "提醒data.table开发人员：请勿在内部使用getRversion()。"
+"将行为测试添加到.onLoad"
 
 msgid "Provide either threads= or percent= but not both"
-msgstr ""
+msgstr "提供threads=或percent=，但不能两者都提供"
 
 msgid "percent= is provided but is length"
-msgstr ""
+msgstr "提供了percent =，但为长度"
 
 msgid "percent=="
-msgstr ""
+msgstr "percent=="
 
 msgid "but should be a number between 2 and 100"
-msgstr ""
+msgstr "但应为2到100之间的数字"
 
 msgid "Valid options for col.names are 'auto', 'top', and 'none'"
 msgstr "对col.names有效的参数为'auto', 'top', and 'none'"