💄 style(language-switcher): update icon to be lighter (#173)

Co-authored-by: welpo <welpo@users.noreply.github.com>

sass/parts/_header.scss

@@ -91,13 +91,13 @@ header {
 }
 
 .language-switcher-icon {
-    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 96 960 960'><path d='M480 976q-84 0-157-31.5T196 859q-54-54-85-127.5T80 574q0-84 31-156.5T196 291q54-54 127-84.5T480 176q84 0 157 30.5T764 291q54 54 85 126.5T880 574q0 84-31 157.5T764 859q-54 54-127 85.5T480 976Zm0-58q35-36 58.5-82.5T577 725H384q14 60 37.5 108t58.5 85Zm-85-12q-25-38-43-82t-30-99H172q38 71 88 111.5T395 906Zm171-1q72-23 129.5-69T788 725H639q-13 54-30.5 98T566 905ZM152 665h159q-3-27-3.5-48.5T307 574q0-25 1-44.5t4-43.5H152q-7 24-9.5 43t-2.5 45q0 26 2.5 46.5T152 665Zm221 0h215q4-31 5-50.5t1-40.5q0-20-1-38.5t-5-49.5H373q-4 31-5 49.5t-1 38.5q0 21 1 40.5t5 50.5Zm275 0h160q7-24 9.5-44.5T820 574q0-26-2.5-45t-9.5-43H649q3 35 4 53.5t1 34.5q0 22-1.5 41.5T648 665Zm-10-239h150q-33-69-90.5-115T565 246q25 37 42.5 80T638 426Zm-254 0h194q-11-53-37-102.5T480 236q-32 27-54 71t-42 119Zm-212 0h151q11-54 28-96.5t43-82.5q-75 19-131 64t-91 115Z'/%3E%3C/svg%3E%0A");
+    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='%23000' stroke-width='1.8' d='M1 12a11 11 90 0 0 22 0 11 11 90 0 0-22 0m1-4h20M2 16h20M11 1a21 21 90 0 0 0 22m2-22a21 21 90 0 1 0 22'/%3E%3C/svg%3E%0A");
     position: relative;
     align-self: center;
     cursor: pointer;
     background: var(--text-color);
-    width: 1.2rem;
-    height: 1.2rem;
+    width: 1rem;
+    height: 1rem;
 }
 
 .dropdown {