[content] Replace quotation marks symbols to <<, >>

Fix build.
(cherry picked from commit 587dd77d25)

config.tex

@@ -20,6 +20,7 @@
 \usepackage{xstring}
 \usepackage{tabularx}
 \usepackage{enumitem}
+\usepackage[strict=true]{csquotes}
 \usepackage[abspath]{currfile}
 \usepackage[hidelinks,linktoc=all]{hyperref}
 
@@ -172,3 +173,60 @@
 
 % ОФОРМЛЕНИЕ ТЕКСТА
 \renewcommand{\baselinestretch}{1.5}
+\MakeOuterQuote{"}
+
+\makeatletter
+\DeclareRobustCommand\vdots{%
+  \mathpalette\@vdots{}%
+}
+\newcommand*{\@vdots}[2]{%
+  % #1: math style
+  % #2: unused
+  \sbox0{$#1\cdotp\cdotp\cdotp\m@th$}%
+  \sbox2{$#1.\m@th$}%
+  \vbox{%
+    \dimen@=\wd0 %
+    \advance\dimen@ -3\ht2 %
+    \kern.5\dimen@
+    % remove side bearings
+    \dimen@=\wd2 %
+    \advance\dimen@ -\ht2 %
+    \dimen2=\wd0 %
+    \advance\dimen2 -\dimen@
+    \vbox to \dimen2{%
+      \offinterlineskip
+      \copy2 \vfill\copy2 \vfill\copy2 %
+    }%
+  }%
+}
+\DeclareRobustCommand\ddots{%
+   \mathinner{%
+      \mathpalette\@ddots{}%
+      \mkern\thinmuskip
+   }%
+}
+\newcommand*{\@ddots}[2]{%
+   % #1: math style
+   % #2: unused
+   \sbox0{$#1\cdotp\cdotp\cdotp\m@th$}%
+   \sbox2{$#1.\m@th$}%
+   \vbox{%
+      \dimen@=\wd0 %
+      \advance\dimen@ -3\ht2 %
+      \kern.5\dimen@
+      % remove side bearings
+      \dimen@=\wd2 %
+      \advance\dimen@ -\ht2 %
+      \dimen2=\wd0 %
+      \advance\dimen2 -\dimen@
+      \vbox to \dimen2{%
+         \offinterlineskip
+         \hbox{$#1\mathpunct{.}\m@th$}%
+         \vfill
+         \hbox{$#1\mathpunct{\kern\wd2}\mathpunct{.}\m@th$}%
+         \vfill
+         \hbox{$#1\mathpunct{\kern\wd2}\mathpunct{\kern\wd2}\mathpunct{.}\m@th$}%
+      }%
+   }%
+}
+\makeatother