fix accidentally removed icon

static/font/font/fontello.svg

@@ -62,6 +62,8 @@
 
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+<glyph glyph-name="plus-squared" unicode="&#xf0fe;" d="M714 321v72q0 14-10 25t-25 10h-179v179q0 15-11 25t-25 11h-71q-15 0-25-11t-11-25v-179h-178q-15 0-25-10t-11-25v-72q0-14 11-25t25-10h178v-179q0-14 11-25t25-11h71q15 0 25 11t11 25v179h179q14 0 25 10t10 25z m143 304v-536q0-66-47-113t-114-48h-535q-67 0-114 48t-47 113v536q0 66 47 113t114 48h535q67 0 114-48t47-113z" horiz-adv-x="857.1" />
+
 <glyph glyph-name="reply" unicode="&#xf112;" d="M1000 232q0-93-71-252-1-4-6-13t-7-17-7-12q-7-10-16-10-8 0-13 6t-5 14q0 5 1 15t2 13q3 38 3 69 0 56-10 101t-27 77-45 56-59 39-74 24-86 12-98 3h-125v-143q0-14-10-25t-26-11-25 11l-285 286q-11 10-11 25t11 25l285 286q11 10 25 10t26-10 10-25v-143h125q398 0 488-225 30-75 30-186z" horiz-adv-x="1000" />
 
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