Glossary at page's end

% special thanks to Nicola Talbot
% http://tex.stackexchange.com/a/292136

\documentclass{book}

\usepackage{everypage}
\usepackage{glossaries-extra}

\AddEverypageHook{%
 \gdef\entrylabellist{}%
}

\GlsXtrEnableEntryUnitCounting{general}{0}{page}

\newcommand*{\entrylabellist}{}

\makeatletter
\def\@glo@sortinghandler{\@glo@sorthandler@word}%
\newcommand*{\sortpageentries}{%
 \forglsentries{\thisentry}{%
   \ifnum\glsentryprevcount{\thisentry}>0\relax
     \expandafter\@glo@sortedinsert\expandafter\entrylabellist\expandafter
       {\thisentry}%
   \fi
 }%
}

\newcommand*{\glsxtrpostlinkgeneral}{%
 \ifnum\glsentrycurrcount{\glslabel}=1\relax
   \footnotemark[1]%
   \ifdefempty\entrylabellist
   {%
     \sortpageentries
     \footnotetext[1]{\@for\thisentry:=\entrylabellist\do{%
      \glsentryname{\thisentry} \glsentrydesc{\thisentry}. }}%
   }%
   {}%
 \fi
}
\makeatother

\newglossaryentry{uno}{name=uno,description=one}
\newglossaryentry{dos}{name=dos,description=two}
\newglossaryentry{tres}{name=tres,description=three}
\newglossaryentry{quatro}{name=quatro,description=four}
\newglossaryentry{cinco}{name=cinco,description=five}


\begin{document}

Counting to three in Spanish, \gls{uno}, \gls{dos},
\gls{tres}.  Counting to five in Spanish, \gls{uno},
\gls{dos}, \gls{tres}, \gls{quatro}, \gls{cinco}.

Notice how \gls{uno}, \gls{dos}, and \gls{tres} only appear once in
the footnotes despite being glossed three times.

\newpage

Test next page.

\gls{tres}, \gls{quatro} and \gls{cinco}.
And again:
\gls{tres}, \gls{quatro} and \gls{cinco}.

\end{document}