fix language choice UI bug

content/en/tex/formulae-advanced.tex

@@ -1,5 +1,4 @@
 \section{Math environments in amsmath package}
-\section{Advanced Math Environments in LaTeX}
 \par In this section, we'll explore some of the advanced math environments provided by the \verb"amsmath" package in LaTeX. These environments are essential for formatting complex mathematical expressions, especially when dealing with multi-line equations.
 
 \subsection{The Equation and Split Environments}
@@ -48,27 +47,35 @@ \section{Exercise}
 \begin{staticpart}
 Type the formulas choosing the appropriate amsmath environments.
 \subsection{First}
+\htmlblockquote{
 \begin{equation}
   e=mc^2
 \end{equation}
+}
 
 \subsection{Second}
+\htmlblockquote{
 \begin{gather*}
   d = \sqrt{ (x_2 - x_1)^2 + (y_2 - y_1)^2 } \\
   \cos \alpha = \frac{b^2 + c^2 - a^2}{2bc}
 \end{gather*}
+}
 
 \subsection{Third}
+\htmlblockquote{
 \begin{multline*}
     P(x) = a_0 + a_1 x + a_2 x^2 + a_3 x^3 + \cdots + \\
     + a_n x^n = \sum_{k=0}^n a_k x^k
 \end{multline*}
+}
 
 \subsection{Fourth}
+\htmlblockquote{
 \begin{align}
     \sin 2x &= 2 \sin x \cos x \\
     1 &= \sin ^2 x + \cos ^2 x
 \end{align}
+}
 
 \end{staticpart}
 

index.html

@@ -63,7 +63,7 @@
         <h1 class="card-title" id="mainTitle">Interactive Introduction to \( \LaTeX \)</h1>
 
         <div class="form-group">
-            <h5 class="card-title" id="headerKeywordSearch">Smart Search</h5>
+            <h5 class="card-title" id="headerKeywordSearch">Search</h5>
             <form id="searchForm" class="form-inline" role="search" action="">
                 <label><input type="text" id="searchInput" class="form-control" autocomplete="off">
                     <span class="input-group-btn"><button class="btn btn-outline-secondary" type="submit"><i class="fa fa-search"></i></button></span></label>

js/i18n.js

@@ -95,7 +95,7 @@ let I18N_STRINGS_ALL = {
 
 function setUILanguage(language=null){
     if(!language)
-        language = navigator.languages.indexOf('ru') >= 0 ? 'ru' : 'en';
+        language = localStorage.getItem('displayLanguage') || (navigator.languages.indexOf('ru') >= 0 ? 'ru' : 'en');
 
     window.I18N_STRINGS = I18N_STRINGS_ALL[language];
     window.confirmationSwitchToKaTeX = I18N_STRINGS["confirmation.SwitchToKaTeX"];

js/ilatexprimer.js

@@ -1140,7 +1140,7 @@ $(function() {
 
     $(function(){
         initializeDarkThemeSwitch();
-        setUILanguage('ru');
+        setUILanguage();
         masterReload();
     });
 });