Add some missing flags: tf, wf, yt

flags/tf.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 512 512"><mask id="a"><circle cx="256" cy="256" r="256" fill="#fff"/></mask><g mask="url(#a)"><path fill="#0052b4" d="M0 0h512v512H0z"/><path fill="#eee" d="M0 0h256v256H0z"/><path fill="#0052b4" d="M0 0h75v224H0z"/><path fill="#d80027" d="M149 0h75v224h-75z"/><path fill="#eee" d="M323 158l13 21h36v71l-27-43-37 59h18l19-34 39 70 39-70 19 34h18l-37-59-27 43v-39h16l12-20h-28v-12h36l13-21zm43 88h-40v14h40zm76 0h-40v14h40z"/><path fill="#eee" d="M301 181l13 38-34-23h42l-34 23zm166 0l13 38-34-23h42l-34 23zM339 282l13 38-34-23h42l-34 23zm90 0l13 38-34-23h42l-34 23zm-45 34l13 38-34-23h42l-34 23z"/></g></svg>

flags/wf.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 512 512"><mask id="a"><circle cx="256" cy="256" r="256" fill="#fff"/></mask><g mask="url(#a)"><path fill="#d80027" d="M0 0h512v512H0z"/><path fill="#eee" d="M0 0h256v256H0z"/><path fill="#0052b4" d="M0 0h75v224H0z"/><path fill="#d80027" d="M149 0h75v224h-75z"/><path fill="#eee" d="M384 232l-72-72h144zm-24 24l-72-72v144zm24 24l-72 72h144zm24-24l72-72v144z"/></g></svg>

flags/yt.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><mask id="a"><circle cx="256" cy="256" r="256" fill="#fff"/></mask><g mask="url(#a)"><path fill="#eee" d="M0 0h512v512H0z"/><path fill="#0052b4" d="M196 147a15 15 0 00-15 15 15 15 0 0015 15 15 15 0 00-15 15 15 15 0 0015 15 15 15 0 00-15 15 15 15 0 0015 15h120a15 15 0 0015-15 15 15 0 00-15-15 15 15 0 0015-15 15 15 0 00-15-15 15 15 0 0015-15 15 15 0 00-15-15 15 15 0 00-15 15 15 15 0 00-15-15 15 15 0 00-15 15 15 15 0 00-15-15 15 15 0 00-15 15 15 15 0 00-15-15 15 15 0 00-15 15 15 15 0 00-15-15z"/><path fill="#d80027" d="M196 327a15 15 0 01-15-15 15 15 0 0115-15 15 15 0 01-15-15 15 15 0 0115-15 15 15 0 01-15-15 15 15 0 0115-15h120a15 15 0 0115 15 15 15 0 01-15 15 15 15 0 0115 15 15 15 0 01-15 15 15 15 0 0115 15 15 15 0 01-15 15 15 15 0 01-15-15 15 15 0 01-15 15 15 15 0 01-15-15 15 15 0 01-15 15 15 15 0 01-15-15 15 15 0 01-15 15 15 15 0 01-15-15 15 15 0 01-15 15z"/><path fill="#acabb1" d="M113 139c-4 0-11 2-23 8a59 59 0 00-13 9c-28 27-20 68-11 79 3 4 16 23 32 30 22 8 36 28 37 51 0 24-15 44-34 46h-4c-19 0-36-19-37-43v2c1 29 20 52 43 52s44-12 55-32l5-8a43 43 0 004-14c4-19 6-70-47-95-40-20-45-36-40-43a4 4 0 013-1 19 19 0 0018 19 15 15 0 0010-4s18 18 24 11 0-7-6-14c-5-7 0-21-11-28-12-7-18-7-12-15a16 16 0 0112-7s0-3-5-3zm287 0c-5 0-5 3-5 3 5 1 9 3 12 7 5 8 0 8-12 15s-6 21-12 28c-5 7-11 7-5 14 5 7 24-11 24-11a15 15 0 0010 4 19 19 0 0018-19 4 4 0 012 1c6 7 1 23-40 43-52 25-50 76-47 95l5 14a189 189 0 005 8c10 20 32 33 54 32 24 0 43-23 44-52v-2c-2 24-18 43-38 43h-4c-19-2-33-22-33-46 1-23 15-43 36-51 16-7 29-26 33-30 8-11 17-52-11-79a59 59 0 00-14-9c-12-6-18-8-22-8zM26 199c-1 0-2 1-2 3-2 16-1 52 33 64a2 2 0 003-1l6-8v-4c-5-7-22-31-22-44l-2-2a19 19 0 01-15-7l-1-1zm460 0l-1 1a19 19 0 01-15 7l-2 2c0 13-17 37-21 44v4l5 8a2 2 0 003 1c34-12 35-48 34-64l-3-3z"/><path fill="#eee" d="M232 188a25 25 0 00-1 5 25 25 0 0025 25 25 25 0 0025-25 25 25 0 00-1-5 25 25 0 01-24 19 25 25 0 01-24-19z"/><path fill="#ffda44" d="M283 254a4 4 0 00-4 4v8l-7-4a4 4 0 00-2-1 4 4 0 00-3 2 4 4 0 001 6l7 4-7 3a4 4 0 00-1 6 4 4 0 005 1l7-3v7a4 4 0 004 4 4 4 0 004-4v-7l7 3a4 4 0 005-1 4 4 0 00-1-6l-7-3 7-4a4 4 0 001-6 4 4 0 00-3-2 4 4 0 00-2 1l-7 4v-8a4 4 0 00-4-4zm-54 0a4 4 0 00-4 4v8l-7-4a4 4 0 00-2-1 4 4 0 00-3 2 4 4 0 001 6l7 4-7 3a4 4 0 00-1 6 4 4 0 005 1l7-3v7a4 4 0 004 4 4 4 0 004-4v-7l7 3a4 4 0 005-1 4 4 0 00-1-6l-7-3 7-4a4 4 0 001-6 4 4 0 00-3-2 4 4 0 00-2 1l-7 4v-8a4 4 0 00-4-4z"/></g></svg>