Us Icelanders are a 3rd world country for Google - and at best 4th class citizens.
It took them 7 years to support our clock (UTC) on Android - no kidding: https://issuetracker.google.com/issues/36957647
Even if their support for the Icelandic locale is sadly missing in Google Spreadsheets, then GS runs circles around Excel for our usage purposes (and I'm a long term Excel user).
It is true the workaround I can use after some testing is to convert every spreadsheet to the German locale before pasting, but this has its downsides...
However it would be better if I could control the number format in copied data through preferences or that it would be treated the same way as numbers in csv files (csv files do not contain thousand separators).