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Wikipedia article name with language

In the 'Languages' list in the left sidebar, the language name linking to the same article in that language is complemented with the name of that article.

// ==UserScript==
// @name        Wikipedia article name with language
// @version     1.0.2
// @namespace   http://www.agj.cl/
// @description In the 'Languages' list in the left sidebar, the language name linking to the same article in that language is complemented with the name of that article.
// @license     Unlicense
// @include     http*://*.wikipedia.org/wiki/*
// @grant       none
// ==/UserScript==

(function () {
  "use strict";

  console.log("Executing Wikipedia article name with language.");

  // Utilities.

  const sel = document.querySelector.bind(document);
  const selAll = document.querySelectorAll.bind(document);
  const eq = (a) => (b) => a === b;
  const test = (regex) => (text) => regex.test(text);
  const testOn = (text) => (regex) => regex.test(text);
  const prepend = (a) => (b) => a + b;
  const makeEl = (tag, attrs, ...content) => {
    const el = document.createElement(tag);
    if (attrs)
      Object.keys(attrs).forEach((attr) => el.setAttribute(attr, attrs[attr]));
    content
      .map((obj) =>
        typeof obj === "string" ? document.createTextNode(obj) : obj,
      )
      .forEach((node) => el.appendChild(node));
    return el;
  };
  const pipe = (...fs) =>
    fs.reduce(
      (left, right) =>
        (...args) =>
          right(left(...args)),
    );
  const uniq = (list) => {
    const seen = [];
    return list.filter((item) =>
      seen.some(eq(item)) ? false : (seen.push(item), true),
    );
  };
  const not =
    (f) =>
    (...args) =>
      !f(...args);

  //

  const elements = Array.from(selAll(".interlanguage-link"));

  elements.forEach((el) => {
    const a = el.getElementsByTagName("a")[0];
    const langName = a.textContent;
    const titleAndLanguage = a.getAttribute("title");
    const titleMatcher = [
      /(.+) – .+/, // English, etc.
      /(.+) +\(.+\)/, // Spanish, etc.
      /.+: (.+)/, // Japanese, etc.
    ].find(testOn(titleAndLanguage));
    const title = titleAndLanguage.replace(titleMatcher, "$1");
    a.textContent = "";
    a.appendChild(makeEl("span", { class: "language-name" }, langName));
    a.appendChild(document.createTextNode(" "));
    a.appendChild(makeEl("span", { class: "article-title" }, title));
  });

  // Styles.

  sel("head").appendChild(
    makeEl(
      "style",
      null,
      `
		.interlanguage-link .language-name {
			display: block;
			text-transform: uppercase;
			font-size: 0.7em;
		}
		`,
    ),
  );
})();