With the exportation template you can customize the exportation of the project translations to the language files.
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What is the exportation process? For example, you have 3 translations in your project. For the English language the 3 texts are "Home", "Directory", "Help". You can export the 3 translations to a file with a given template. For example you want the lines of your file being like «MyTranslation_[transref]="[trans]";» Then when you export the 3 translations of your project you will create a file (that we call language file because it represents the english language for your project) that will be like this :