Changing to large letters in the header

Question

Good day!
I am creating a title "Translation dB, dBm"
Now I want to put this header in the header using "fancyhdr", but it prints all letters in all caps. This is good, and I like it, but dB becomes DB, and this is already a mistake.
The question is: is it possible to somehow indicate that dB does not become all capital letters (DB), and let the rest of the text remain in large letters.
documentclass[a4paper,12pt]{article}
usepackage{cmap}
usepackage[T2A]{fontenc}
usepackage[utf8]{inputenc}
usepackage[english,russian]{babel}
usepackage{caption}
usepackage{fancyhdr}
pagestyle{fancy}

begin{document}
tableofcontents 
clearpage 
section{Translation dB, dBm}
end{document}

Davislor · Accepted Answer

The fancyhdr package does provide a nouppercase command that turns the capitalization it normally does off.
To get something like you want, here’s a bit of a hack.  Load fontaxes, which provide textsc to select small caps and textulc to turn small caps off.  Then load a font that contains a Cyrillic small caps face.¹
With the fontaxes package, you can select the primary shape (such as slanted) and the secondary shape (such as small caps) separately.  It gives you textsc and textulc commands to turn small caps on and off.  This lets you combine slanted text, like in the default fancy page style, with small caps text—and specify individual words that should not be in small caps with textulc{dB}.
I also took a few other liberties, such as turning on the [twopage] option, turning on microtype, and loading Unicode fonts in engines that support them.
documentclass[a4paper,12pt,english,russian,twoside]{article}
usepackage{iftex}
iftutex
  usepackage{babel}
  usepackage{unicode-math}
  defaultfontfeatures{Scale=MatchLowercase, Ligatures=TeX}
  babelfont{rm}[Ligatures=Common, Language=Default, Scale=1.0]{Erewhon}
  babelfont{sf}[Ligatures={Common,Discretionary}, Language=Default]{Libertinus Sans}
  babelfont{tt}[Language=Default]{Libertinus Mono}
  setmathfont{Erewhon Math}
else
  usepackage[T2A,T1]{fontenc}
  usepackage[utf8]{inputenc}
  usepackage{cmap}
  usepackage{babel}
  % Loads a Type 1 font family that supports Cyrillic slanted small caps,
  % along with a matching math font, a sans-serif font and a typewriter font.
  usepackage{libertinus-type1}
  usepackage{fourier, erewhon}
  usepackage{fontaxes} % For textsc, textulc, etc.
fi
usepackage{caption}
usepackage{microtype}
usepackage{fancyhdr}

babeltags{english=english}

pagestyle{fancy}
renewcommand{sectionmark}[1]{markright{arabic{section}.~textsc{#1}}}
fancyhead[LO,RE]{{slshapescshapeselectfontnouppercase{leftmark}}}

begin{document}
tableofcontents 
clearpage
begin{english}
section{Translation textulc{dB}, textulc{dBm}}
end{english}
end{document}

¹ As of 2020, the following 8-bit font families define a {scsl} NFSS shape for the {T2A} ecoding: Libertinus, Erewhon, Garamond Libre, XCharter, Noto, and Old Standard.  Several of those do not actually work.

Антон · Answer

Many thanks! It works! It seems to me that there is a lot of unnecessary here. Here is the minimum that continues to work. However, the word "content" is repeated on every page, although this is not necessary, and the inscriptions in the footer are located on the left and then on the right, that is, in a bookish manner. Fixing that would be great!
 documentclass[a4paper,12pt,english,russian,twoside]{article}
usepackage{iftex}
iftutex
fi
usepackage{fancyhdr}
pagestyle{fancy}
renewcommand{sectionmark}[1]{markright{arabic{section}.~textsc{#1}}}

begin{document}
    tableofcontents 
    clearpage
        section{Translation textulc{dB}, textulc{dBm}}
        newpage
        section{Translation textulc{dBtrr}, textulc{dBmerer}}
end{document}

Changing to large letters in the header

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