Not really. At the moment, you will have to delete all the extra nodes by hand. It is possible to edit the code to manually change the "10 yard auto deletion of every nearby node" range to something bigger.
1. The umlaute like u with 2 dots on it is not an issue because the file is in UTF8 format. WoW reads it perfectly fine.
2. The localization for the addon in the addon selection screen in the character selection screen is shown in English for you because if you look at the TOC, ## Title-deDE: and ## Title-deDE: are not defined. As nobody has really bothered to do that.
3. Cartographer_Professions is not a dependency, it is optional. _ExtractGas will support and work with _Professions if it exists, but it is not necessary for _ExtractGas' functioning. _Professions turns on/off _Gas/_Fish/_Mine/_Herb modules based on the settings you give it, such as only turning on if you have that profession.
If _ExtractGas is not loaded, there are 2 possible reasons
A) It errored on loading, supply an error report from Bugsack, Swatter or some other error catching addon
B) It is not loaded because it is LoadOnDemand. Please use _Professions to make it load. If you do not use _Professions, then ExtractGas will stay unloaded until you specifically load it with /script LoadAddOn("Cartographer_ExtractGas") or use another addon that allows you to load ExtractGas. This applies to all the of Herb/Mining/etc gathering modules, _Professions is used as a small stub to load these modules load-on-demand.
To clarify, _Professions is thus a dependency of sorts since it is used as a stub to load the profession modules. It cannot be a direct dependency because _Professions comes as part of the Cartographer package and can function as a embedded module inside Cartographer.
Yes, cwdg's changes completely broke ExtractGas by referring to AceLocale references when it should not, as Cartographer is now a RockLocale addon. I have reverted most of his fixes where addon.L should be used irrespective of whether you are using a Ace2 version or Rock version of Cartographer.
Update your ExtractGas, changes should go live within 20 minutes.