This article is for the people who help us localizing BlueGriffon. I have a Firefox add-on made for you : L10N Checker. It can take two directories, for instance the en-US locale dir and the zh-TW locale dir and compare all dtd and properties file inside. It reports missing files on both ends, duplicate entries. It can report if a BOM marker is present in a file and if an entity is unchanged between the reference file and your localization, potentially indicating you still have some thing to translate.
Yes, I know Mozilla has tools like compare-locales and such. But these are commandline-based and I wanted something simpler giving the same results for the BlueGriffon L10N community.
After installation in Firefox >=5, you'll find the L10N Check men entry under the Tools menu.