Incidentally, the word 'so' has migrated from English into Irish in the last century. Until Irish was so pressed-in-upon by English, 'agus' ('and') was used in contexts where 'so' would normally be used in English; now, however, 'so' is used. I mean, of course, in sentences like 'He's going to be late, so she'll be annoyed'.
In senses like 'I'll leave it there so', the normal usage in Irish (always, including today) would be '…má 'sea'.