non riesco a rinominare Figure in Fig.

Salve,

qualcuno sa spiegarmi perchè nonostante utilizzi il comando
`\renewcommand{\figurename}{Fig.}`
e analogo per le tabelle continuo a vedere scritto Figura e Tabella anziché Fig. e Tab.?
Quando faccio i riferimenti a figure e tabelle uso il codice:
`\figurename{}~\ref{fig:AAA}`

`\documentclass[a4paper,11pt]{book}

%\usepackage[bindingoffset=1cm]{geometry}
%\usepackage{emptypage}
\usepackage[utf8]{inputenc}
\usepackage[italian]{babel}
\usepackage[italian]{varioref}
\usepackage[T1]{fontenc}
\usepackage[pdftex]{graphicx}
\usepackage[figuresright]{rotating}
\usepackage{multicol}
\usepackage{subfigure}
\usepackage{textcomp}
\usepackage{color}
\usepackage{booktabs}
\usepackage{enumitem}
\usepackage{amssymb}
\usepackage{threeparttable}
\usepackage[pdftex]{lscape}
\usepackage{eurosym}
\usepackage{footmisc}
\usepackage{numprint}
\usepackage{ccaption}
%\usepackage[opta]{optional} % Commentare per rendere il testo opz NON VISIBILE
\usepackage[NO]{optional} % Non Commentare per rendere il testo opz VISIBILE

\usepackage{fancyhdr}

\usepackage[pdftex]{hyperref}

%%% DEFINIZIONE TESTATINE %%%
\pagestyle{fancy}

\renewcommand{\chaptermark}[1]{\markboth{\chaptername\ \thechapter.\ #1}{}}
%\renewcommand{\chaptermark}[1]{\markboth{#1}{}}
\renewcommand{\sectionmark}[1]{\markright{\thesection\ #1}{}}

\fancyhf{}
\fancyhead[LE]{\leftmark}
\fancyhead[RO]{\rightmark}
\fancyfoot[RO,LE]{\thepage}
\fancyfoot[RE,LO]{Bozza}
\renewcommand{\footrulewidth}{0.4pt}
\renewcommand{\headrulewidth}{0.4pt}

%%% FANCY STYLE PLAIN %%%
\fancypagestyle{plain}{%
\fancyhf{}%
\renewcommand{\headrulewidth}{0pt}%
\renewcommand{\footrulewidth}{0pt}%
}
%%%%%%%%%%%%%%%%%%%%

%%% FANCY frontmatter per indici %%%

\fancypagestyle{fancyfront}{%
\fancyhf{}%
\fancyhead[LE,RO]{\rightmark}%
\fancyfoot[RO,LE]{\thepage}%
\fancyfoot[RE,LO]{Bozza}%
\renewcommand{\footrulewidth}{0.4pt}%
\renewcommand{\headrulewidth}{0.4pt}%
}
%%%%%%%%%%%%%%%%%%%%

%%% FANCY frontmatter per sommario e ringraziamenti %%%

\fancypagestyle{fancysommario}{%
\fancyhf{}%
%\fancyhead[LE,RO]{\rightmark}%
%\fancyfoot[RO,LE]{\thepage}%
%\fancyfoot[RE,LO]{Bozza}%
\renewcommand{\footrulewidth}{0pt}%
\renewcommand{\headrulewidth}{0pt}%
}
%%%%%%%%%%%%%%%%%%%%

%%% Creazione ambiente sommario %%%
\newenvironment{sommario}{%
\cleardoublepage\null\vfill \begin{center}%
\bfseries\large \abstractname \end{center}}%
{\vfill\null}

%%% Creazione ambiente ringraziamenti %%%

\newenvironment{ringraziamenti}{%
\cleardoublepage\null\vfill \begin{center}%
\bfseries\large Ringraziamenti \end{center}}%
{\vfill\null}

%%% Modifica liste DESCRIPTION %%%
\newenvironment{descriptionacapo}{%
\begin{description}[style=nextline,leftmargin=17mm,topsep=0mm]}%
{%
\end{description}
}%

\newenvironment{commento}{%
%
}

%%% GESTIONE MARGINI PAGINA PER INSERIMENTO FIGURE %%%
\renewcommand{\topfraction}{0.85}
\renewcommand{\textfraction}{0.1}
\renewcommand{\floatpagefraction}{0.75}

%%% FIGURA TEMPORANEA %%%
\newcommand{\tmpfig}[1]
{
\begin{figure}[ht]
\centering
\includegraphics{../../Latex/img_tmp/imgtmp.jpg}
\caption{#1}
\end{figure}
}

%%% CAMBIARE I FONTS DELLE CAPTIONS %%%

\captiontitlefont{\small\em}

%\newcommand{\captionfonts}{\small\em}

%\makeatletter % Allow the use of @ in command names
%\long\def\@makecaption#1#2{%
%\vskip\abovecaptionskip
%\sbox\@tempboxa{{\captionfonts #1: #2}}%
%\ifdim \wd\@tempboxa >\hsize
%{\captionfonts #1: #2\par}
%\else
%\hbox to\hsize{\hfil\box\@tempboxa\hfil}%
%\fi
%\vskip\belowcaptionskip}
%\makeatother % Cancel the effect of \makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%% RINOMINO COMANDI %%%
\renewcommand{\baselinestretch}{1.2} %imposta l'interlinea
\renewcommand{\figurename}{Fig.}
\renewcommand{\tablename}{Tab.}

%%% NUOVI COMANDI %%%
\newcommand{\smgcs}{Sistema di Guida e Controllo dei Movimenti al Suolo }
\newcommand{\eng}[1]{\emph{#1}}
\newcommand{\nota}[1]{\textbf{\color{red} #1}}
\newcommand{\temp}[1]{\textbf{\color{blue} #1}}
\newcommand{\self}{\eng{self-maneuvering}}
\newcommand{\push}{\eng{push-back}}

\begin{document}

%\input{copertina.tex}

\frontmatter
\pagestyle{fancysommario}
%\input{dedica.tex}
%\input{sommario.tex}
%\input{ringraziamenti.tex}
%\cleardoublepage
%\pagestyle{fancyfront}
%\tableofcontents
\listoffigures
%\listoftables
%\cleardoublepage
%\input{introduzione.tex}

\mainmatter
\pagestyle{fancy}
%\input{aeroporto.tex}
%\input{smgcs.tex}
%\input{progetto2.tex}
\input{sviluppi_futuri.tex}
%\input{conclusioni.tex}

\appendix
\input{appendici.tex}

\backmatter
\input{bibliografia.tex}
%\input{glossario.tex}

\end{document}
`

grazie.