replace " with "{} to make sure " does not induce an umlaut: http://s…

…tackoverflow.com/q/18125539/559676

NEWS.md

@@ -36,6 +36,10 @@
 
 - removed the global option `KNITR_PROGRESS`, which was introduced to suppress the progress bar, but now we have got `knit(..., quiet = TRUE)`, so this option is redundant
 
+## BUG FIXES
+
+- in LaTeX output, the double quotes `"` in the messages, errors, and warnings are replaced by `"{}` because they might cause trouble to babel: http://stackoverflow.com/q/18125539/559676 (thanks, Thierry)
+
 # CHANGES IN knitr VERSION 1.3
 
 ## NEW FEATURES

R/hooks-latex.R

@@ -196,8 +196,10 @@ hook_plot_tex = function(x, options) {
 .color.block = function(color1 = '', color2 = '') {
   function(x, options) {
     x = gsub('\n*$', '', x)
-    sprintf('\n\n{\\ttfamily\\noindent%s%s%s}',
-            color1, escape_latex(x, newlines = TRUE, spaces = TRUE), color2)
+    x = escape_latex(x, newlines = TRUE, spaces = TRUE)
+    # babel might have problems with "; see http://stackoverflow.com/q/18125539/559676
+    x = gsub('"', '"{}', x)
+    sprintf('\n\n{\\ttfamily\\noindent%s%s%s}', color1, x, color2)
   }
 }