Creating left to right and right to left dictionaries using Glossaries package

Question

I want to produce two bilingual dictionaries Arabic-English and English-Arabic. I've found this discussion which seems of some interest for my needs... So I build this file, based on it

\documentclass[twocolumn]{article}
\usepackage{fontspec}
\usepackage{polyglossia}

\newcommand*{\glossaryname}{Dictionary}

\usepackage[nonumberlist,nopostdot,xindy]{glossaries}

\newcommand{\dictentry}[3][\dictlabel]{%
 \def\dictlabel{#2}%
 \newglossaryentry{#1}{name=#3,description={#2}}%
 \glsadd{#1}%
}

\makeglossaries

\setmainlanguage{english}
\setotherlanguage[locale=mashriq]{arabic}
\setmainfont[Ligatures=TeX]{Linux Libertine O}
\newfontfamily\arabicfont[Script=Arabic,Scale=1.3,Mapping=arabicdigits]{Traditional Arabic}


\newglossarystyle{RLsuper}{%
 \glossarystyle{super}% base this style on 'super'
  \renewenvironment{theglossary}%
    {\tablehead{}\tabletail{}%
     \begin{supertabular}{lr}}% adjust column specifiers
    {\end{supertabular}}%
  % switch name and description columns:
  \renewcommand*{\glossaryentryfield}[5]{%
    \glsentryitem{##1}\glstarget{##1}{##3} & ##2\\}%
}


\begin{document}
%%% ENTRIES %%%%%%%%%%%
\dictentry{on}{\textarabic{هو}}%
\dictentry{ja}{\textarabic{انا}}%
\dictentry{pies}{\textarabic{كلب}}%
\dictentry{Dice}{\textarabic{زهرة نرد}}%
\dictentry{Commutative laws}{\textarabic{قوانين إبدالية}}%
\dictentry{Maximum likelihood estimate}{\textarabic{مقدر الاحتمال الأعظم}}%

\RTLdblcol
\printglossary[style=RLsuper]%

\end{document}

which gave on the first compilation a good pdf file (what I can't add to discussion because I don't know how!)...

But when I copy this file and create another file which is strictly the same, for a second try, the compilation gave me a blank pdf file... An empty file... So my questions are:

1. What happens between the two compilations?
2. I want to create two dictionaries, one sorted in Arabic order, and the same dictionary but sorted in the English alphabet order, how can I do this?
3. For long entries like "Maximum likelihood estimate", can I split the glossary output in two lines (produced by macros like this, based on something like \begin{tabular} m{2.5cm}m{2.5cm}} \end{tabular} for example...
4. A question which seems simple, but of interest for me... How can I insert things like rules for example between the entries... exactly \hrule\hrule...

I can't try it because it doesn't compile! More generally, where are stocked the entries after sorting? How can I do small changes on it directly?