When translating German texts (and probably not only there) often a number is followed by a period to indicate an ordinal number:
Dieses war der 1. Streich, Doch der 2. folgt sogleich.
How to prevent splitting after these ordinal numbers?
You’ll have to define a segmentation rule like this:
<rule break=”no”><beforebreak>\b\d\.\s</beforebreak><afterbreak>(Absatz|Alarm|Auflage|Ausgabe|Druck|Ebene|Eintrag|Ergänzung|Inbetrieb|Menü|
Phase|Reihe|Schritt|Spalte|Spülen|Streich|Stufe|Ventil|Verordnung|Zahl|
Zeichen|Zeile|Zeit|Ziffer)</afterbreak></rule>
A short explanation of the expressions:
\b stands for a word boundary
\d stands for a digit
\s stands for a space
| (the pipe character) stands for or (the logical operator to separate alternatives)