Add multilingual language and systems learning tracks

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+<!doctype html><html lang="en"><meta charset="utf-8"><title>Endianness is a byte-order rule</title><h1>Endianness is a byte-order rule</h1><p>15-minute session: read for 3 minutes, trace for 3, experiment for 7, and complete the check for 2. Spend longer whenever you need.</p><p>The number 0x1234 can be stored as bytes 34 12 in little-endian order or 12 34 in big-endian order. The number is unchanged; the representation changes. Run both conversions and decode them back. A file or network protocol must specify byte order instead of copying a host struct blindly. C struct padding and alignment are separate concerns.</p><pre><code class="language-python">value=0x1234
+print(value.to_bytes(2,&quot;little&quot;).hex())
+print(value.to_bytes(2,&quot;big&quot;).hex())
+</code></pre><p><strong>Expected result:</strong> <code>3412
+1234</code></p><h3>Practice and evidence</h3><p>Keep three notes: your prediction, the actual result, and why they match or differ. The completion check grades understanding; the practice task builds skill.</p><p><a href="https://www.intel.com/content/www/us/en/developer/articles/technical/intel-sdm.html">Language reference: www.intel.com</a></p><p><a href="https://developer.arm.com/Architectures/Learn%20the%20Architecture">Language reference: developer.arm.com</a></p><p><a href="https://docs.riscv.org/">Language reference: docs.riscv.org</a></p></html>