Perhaps time to join this discussion:
Let me say it that way: As long as you set the correct charset (as @Rob already mentioned) and as long as you type the words natively within PG - there should be no issue at all.
I made a pretty strange experience though which is NOT exclusively PG when it comes to “copying text from files”. There I had problems with the Umlaut “Ü”. As a safety-precaution, I always try to remember “the paste without formatting” key-combination which is Shift + Alt + CMD + v on a Mac. The interesting part is, that my copywriter is as well on Mac as me - and I never found any explanation for it.
Because of this, I preferably paste text within the TAG of the Element Code (rather direct into the workspace).