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1) Did you know, that after updating the plugin, the language files are overwritten to newer ones? I have them in my joomlainstall/language folder.
The language files are overwritten when you upgrade. I'd recommend using the Extensions -> Languages -> Overrides feature in Joomla to create permanent overrides which will not be overwritten when you upgrade.
I'm unsure of this. Please try the "Refresh Cache" option to see if that works. If not, we can investigate further.
2) Why is the update of this plugin not visible in the updates list of Joomla, and do I have to do it manually?
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