The ResourceBundle Editor Eclipse Plugin provides a nice GUI for editing language property files.
Update: In my company we use Multilizer for localizing our Delphi applications. There are tools included for external translators. In their feature matrix a Java properties file plugin is mentioned, but I have no expierence with that plugin. Maybe it's worth a look.
Transifex is a web based translation platform which supports Java .properties files. I've used Transifex in multiple Java projects to localize my GUI, and I must say it really works well.
Transifex costs some money, but it's free of charge for open source projects.
crowdin is an excellent resource which I have seen many popular software bases utilize. While I have never participated in the development side of using this website, I have participated in translations which have been quite simple to understand, get in, and start translating quickly. Looking at the supported software, it states that it supports exporting projects into .properties files which is what you are looking for.
Our localization team uses poeditor.com It works with .properties files and the thing I like most is that it integrates with the projects on GitHub. If your project is Open Source or has less than 1000 strings, it's free of charge.
We use https://webtranslateit.com/ as a hosted solution - we upload the english resource bundle with our continuous integration server, our users translate this online, and then we donwload the translated bundles. It's nice that the translators can do this online, and you have control over the files and the history.
Zanata is a web-based translation platform that understands .properties files natively. It supports the standard .properties encoding (ISO-8859-1), but also non-standard utf-8 encoding since some choose to use it.
COI declaration: I am part of the core development team for Zanata.
If your project uses Maven, a Maven plugin is available to update source strings and translations as part of your build. Other clients are available for integrating with other build processes.
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ResourceBundle Editor Eclipse 插件提供了一个漂亮的 GUI，用于编辑语言属性文件。
更新：
在我的公司，我们使用 Multilizer 来本地化我们的 Delphi 应用程序。其中包含供外部翻译人员使用的工具。在他们的功能矩阵中提到了一个 Java 属性文件插件，但我没有使用该插件的经验。也许值得一看。
The ResourceBundle Editor Eclipse Plugin provides a nice GUI for editing language property files.
Update:
In my company we use Multilizer for localizing our Delphi applications. There are tools included for external translators. In their feature matrix a Java properties file plugin is mentioned, but I have no expierence with that plugin. Maybe it's worth a look.
我建议您 oneskyapp.com
I recommend you oneskyapp.com
还有一个新的，名为 http://lokali.se。
对项目意识形态和诸如导出和自定义 zip 上的 webhook 之类很酷的东西有一点不同的看法。
There is also a new one, called http://lokali.se.
A bit different view on project ideology and cool stuff like webhooks on export and custom zips.
Transifex 是一个基于 Web 的翻译平台，支持 Java
.properties文件。我已经在多个 Java 项目中使用 Transifex 来本地化我的 GUI，我必须说它确实运行良好。Transifex 需要花费一些钱，但对于开源项目来说是免费的。
Transifex is a web based translation platform which supports Java
.propertiesfiles. I've used Transifex in multiple Java projects to localize my GUI, and I must say it really works well.Transifex costs some money, but it's free of charge for open source projects.
crowdin 是一个优秀的资源，我见过许多流行的软件库都在使用它。虽然我从未参与过使用该网站的开发工作，但我参与过翻译，这些翻译非常容易理解、入门并快速开始翻译。查看支持的软件，它声明它支持将项目导出到 .properties 文件中，这正是您正在寻找的。
crowdin is an excellent resource which I have seen many popular software bases utilize. While I have never participated in the development side of using this website, I have participated in translations which have been quite simple to understand, get in, and start translating quickly. Looking at the supported software, it states that it supports exporting projects into .properties files which is what you are looking for.
您可以使用任何文本编辑器（例如 notepad++）添加/编辑它们。
还有一个方便的 Eclipse 插件 开发人员也可以使用。不确定在这种情况下这对您是否有好处。
You can just add/edit to them using any text editor such as notepad++
There's also a handy Eclipse plugin that can be used by developers as well. Not sure if this is any good to you in this case.
我们的本地化团队使用 poeditor.com
它与 .properties 文件配合使用，我最喜欢的是它与 GitHub 上的项目集成。
如果您的项目是开源的或少于 1000 个字符串，则它是免费的。
Our localization team uses poeditor.com
It works with
.propertiesfiles and the thing I like most is that it integrates with the projects on GitHub.If your project is Open Source or has less than 1000 strings, it's free of charge.
我们使用 https://webtranslateit.com/ 作为托管解决方案 - 我们通过持续集成上传英语资源包服务器，我们的用户在线翻译它，然后我们下载翻译后的包。很高兴翻译人员可以在线完成此操作，并且您可以控制文件和历史记录。
Java 属性文件的本地化
管理
We use https://webtranslateit.com/ as a hosted solution - we upload the english resource bundle with our continuous integration server, our users translate this online, and then we donwload the translated bundles. It's nice that the translators can do this online, and you have control over the files and the history.
Managing the localization of Java properties files
Best regards
Zanata 是一个基于网络的翻译平台，可以本地理解 .properties 文件。它支持标准 .properties 编码 (ISO-8859-1)，但也支持非标准 utf-8 编码，因为有些人选择使用它。
COI 声明：我是 Zanata 核心开发团队的一员。
如果您的项目使用 Maven，则可以使用 Maven 插件来更新源字符串和翻译，作为构建的一部分。其他客户端可用于与其他构建流程集成。
您可以在公共服务器上托管开源项目（请参阅http://zanata.org）。对于私人开发，您可以托管自己的服务器（请参阅http://zanata.org/download/）。
如果您想了解更多详细信息，我会更新此答案。
Zanata is a web-based translation platform that understands .properties files natively. It supports the standard .properties encoding (ISO-8859-1), but also non-standard utf-8 encoding since some choose to use it.
COI declaration: I am part of the core development team for Zanata.
If your project uses Maven, a Maven plugin is available to update source strings and translations as part of your build. Other clients are available for integrating with other build processes.
You can host open source projects on the public server (see http://zanata.org). For private development you can host your own server (see http://zanata.org/download/).
If you want more detail I'll update this answer.