The Hebrew version there is not very accurate either (actually translates to "I love her", which is not what you want to say, I think..
So, if it's a guy telling a girl: Ani ohev otach
Girl telling guy:Ani ohevet otcha
and to be politically correct -
Guy telling guy: Ani ohev otacha
Girl telling girl: Ani ohevet otach
Of course there's the whole Hebrew letters thing, but I won't get you into that..