Bilingual International Formal Correspondence

\documentclass[paper=a4,fontsize=11pt,parskip=half,DIV=11,headsepline,footsepline,addrfield=true,backaddress=false,locfield=narrow,foldmarks=off,enlargefirstpage=on]{scrlttr2}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
\usepackage[table]{xcolor}
\usepackage{tikz}
\usepackage{tcolorbox}
\usepackage{tabularx}
\usepackage{booktabs}
\usepackage{enumitem}
\usepackage{fontawesome5}
\usepackage{lastpage}

\definecolor{navy}{RGB}{22,36,58}
\definecolor{gold}{RGB}{176,141,74}
\definecolor{stone}{RGB}{96,100,108}
\definecolor{pale}{RGB}{244,242,236}

\setlength{\parindent}{0pt}

% ---------------------------------------------------------------------------
% Bilingual side-by-side paragraph: English (left, upright) / French (right, italic)
% ---------------------------------------------------------------------------
\newcommand{\bilingual}[2]{%
\noindent\begin{minipage}[t]{0.475\textwidth}\raggedright\small #1\end{minipage}\hspace{0.012\textwidth}%
{\color{gold}\vrule width 0.6pt}\hspace{0.012\textwidth}%
\begin{minipage}[t]{0.475\textwidth}\raggedright\small\itshape #2\end{minipage}\par\smallskip
}

% Section title: English left, French subtitle right, gold rule beneath
\newcommand{\sectiontitle}[2]{%
\vspace{2pt}\noindent{\color{navy}\bfseries\large #1}\hfill{\color{gold}\itshape\small #2}\par
\noindent{\color{gold}\rule{\dimexpr\linewidth-11pt\relax}{0.7pt}}\par\smallskip
}

% ---------------------------------------------------------------------------
% Sender identity
% ---------------------------------------------------------------------------
\setkomavar{fromname}{Meridian Chamber of International Commerce}