Missing translation keys from recent on-demand updates

[Luca Heise]

Hello,

I noticed that some translations are missing on macOS and iOS as just 
the translation-keys are shown.

According to a diff (at least) the following keys from the 
original/English version are neither in the German Localizable.strings 
nor in the German crowdin. Looks like this in other languages too.

All of these keys were added in the last updates, so I assume that they 
were just forgotten to be added.

tunnelListCaptionOnDemand
tunnelStatusAddendumOnDemand
tunnelStatusOnDemandDisabled
tunnelStatusAddendumOnDemandEnabled
tunnelStatusAddendumOnDemandDisabled
tunnelOnDemandSSIDTextFieldPlaceholder


I don't really know the translation process here. I think adding these 
keys to crowdin so people could start to translate would be the first 
step. Can anyone do that?

Luca