In Pages, the listed templates are based on the system language that is enabled in the System Preferences. I am Dutch, but prefere English as a system language, so I am apparently out of luck. However, it is possible to change all the different templates to your preferred language for writing with the following simple task:
- Go to Pages.app, control-click on it, and choose Show Package Contents.
- Inside the Contents folder, go to: Resources -> your preferred writing language -> Templates.
- Highlight the "ISO" folder, and hit Command-C to copy it.
- Go to Resources -> English.lproj -> Templates.
- Rename the English "ISO" file (for backup purposes).
- Paste the copied "ISO" folder.
[
robg adds: I have not tested this one...]