Each intercom button on a FSII BP can display 10 characters (2 rows of 5 chars). The software tries to align the characters a best as possible.
Please note the following
Depending on the typed text a "space" can be registered as a line break for ‘best’ formatting where possible and may be word wrapped. This is per spec.
Some wide characters may not fit on the screen correctly like M or W or Ä
Known issue using FSII BP 19 code v0.74 and FSII BP 24 code v0.45 : The text displayed in the role name region is processed differently to the text shown on the intercom label
Example below
The role name is 1åäöÅÄÖ (bottom left), and there is another label åäöÅÄÖ  (top right). The BP only displays ‘1’ where the role name should be displayed in full in the role area, whereas a regular label (for the same role) is displayed fine in the normal user area. This is something specific to role labels, and not to general labels.