The original definitions (full and abbreviated version) can be found in the language-specific .lbx files. Here's the relevant code snippet from english.lbx:
backrefpage = {{cited on page}{cit\adddotspace on p\adddot}},
backrefpages = {{cited on pages}{cit\adddotspace on pp\adddot}},
These strings are declared using the \DeclareBibliographyStrings command which is only available in .lbx files. Outside these files, you have to use \DefineBibliographyStrings which "overrides both the full and the abbreviated version of the string" (biblatex manual, section 3.8).
\DefineBibliographyStrings{english}{%
backrefpage = {<newtext>},
backrefpages= {<newtext>},
}
You are using bibstyle=chem-acs, which means that the citation style is unchanged from the biblatex default. You probably want the chem-acs citation style too, which is much easier to do using style=chem-acs:
\begin{filecontents}{\jobname.bib}
@article{James2003,
author = {James, S. L.},
journal = {Chem. Soc. Rev.},
number = {5},
pages = {276--288},
title = {{Metal-organic frameworks}},
volume = {32},
year = {2003}
}
@article{Rowsell2004,
author = {Rowsell, Jesse L.C. and Yaghi, Omar M.},
journal = {Microporous Mesoporous Mater.},
pages = {3--14},
title = {{Metal-organic frameworks: a new class of porous materials}},
volume = {73},
year = {2004}
}
@article{Allendorf2009,
author = {Allendorf, M. D. and Bauer, C. A. and Bhakta, R. K. and Houk, R. J. T.},
journal = {Chem. Soc. Rev.},
number = {5},
pages = {1330--1352},
title = {{Luminescent metal-organic frameworks.}},
volume = {38},
year = {2009}
}
\end{filecontents}
\documentclass[12pt,a4paper,bibliography=totoc]{scrreprt}
\usepackage[ngerman]{babel}
\usepackage[backend=biber,style=chem-acs,biblabel=brackets]{biblatex}
\bibliography{\jobname}
\begin{document}
Somebody told me.\cite{James2003,Allendorf2009,Rowsell2004}
\printbibliography
\end{document}
This automatically sets sorting=none and sortcites=true as that is standard for chemistry styles.
Best Answer
Both of these citations commands are defined in
biblatex.def. To add links, you can redefine them in your document preamble or configuration file. A linked variant of\citeauthoris already addressed in this previous question. The\citetitlecommand can be revised similarly, although note that you may wish to swap the order of thebibhyperrefandcitetitleformats.