Eclipse ResourceBundle Editor is used for editing Java resource bundles: it lets you manage all localized properties files in one screen. Some of its features are: sorted keys, warning icons on missing keys/values, conversion to/from Unicode, hierarchical view of keys.
It is highly recommended to use this plugin if you have to edit localized properties files. This will save you time (as it is really efficient) and errors (forgetting message translation, converting special characters, ...).
To learn more this plugin, please visit the following link:
This plugin does not provide an install and update site, so you have to download and install it manually.
Before using the plugin, you must configure it so that it accepts empty keys in properties files.
To do so, go to the Eclipse preferences, in the "ResourceBundle Editor --> Format" tab, and select the "Keep properties with empty values" option.
When you want to edit a set of localized properties files, right-click on one of them (the default one or another one that has a locale extension like "_en" or "_fr") and select "Open with -> ResourceBundle Editor". You can start editing at the same time all the localized properties file using the different horizontal panels on the right.
In the editor, you can easily see if there are missing keys/values: they are identified by a little warning icon on the left part of the editor.