\documentclass[a4paper,12pt,oneside,romanian]{report}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[romanian]{babel}
\usepackage[usenames,dvipsnames]{color}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\selectlanguage{romanian}
\overfullrule=2cm
\makeatletter
\ProvideTextCommandDefault\textcommabelow[1]
{\hmode@bgroup\ooalign{\null#1\crcr\hidewidth\raise-.31ex
\hbox{\check@mathfonts\fontsize\ssf@size\z@
\math@fontsfalse\selectfont,}\hidewidth}\egroup}
\ProvideTextCommandDefault\textcommabelowb[1]