Usually the keyboard shortcuts overview shows lower case letters, even if shift is used in combination (for example Shift + u for marking a topic as unread). So I would read the shortcut to insert a template as a lower case “L”. While it might be obvious that it is an “i” for insert as long as the interface language is English, it is quite difficult to notice if it is not.
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Moin, you have the “i” 
of a hawk 
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Thanks @Moin! You’ve certainly got an i / I for detail. I’ve asked my team to touch this up to clarify the correct keyboard shortcuts:
Ctrl + Shift + i on PCs
⌘ + Shift + i on Mac
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…and we’re all set with our freshly clarified shortcut!
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