Fixed Bugs/Fixes related to SNS buttons

■【iPhone】Fixed a bug where the Hatena bookmark icon was not displayed on the share button in the fixed footer bar.
■Removed the discontinued Google+ service from the social networking buttons in the header and footer and replaced it with YouTube.
■Removed discontinued Google+ from the contributor profile.

The following are the files that have been modified for this update.

【Modified files】
admin/inc/basic.php
admin/theme-options.php
author.php
css/footer-bar.css
footer.php
functions/update_notifier.php
functions/user_profile.php
header.php
languages/ja.mo
languages/ja.po
style.css
template-parts/footer-bar.php

【Added files】
img/hatenabookmark-logomark.svg

更新情報をテーマ毎に検索する

CODE.(TCD090) FALCON (TCD089) SOLARIS (TCD088) DROP (TCD087) meets (TCD086) Muum (TCD085) MASSIVE（TCD084） ANTHEM（TCD083） CURE（TCD082） Tree（TCD081） HAKU（TCD080） EGO. （TCD079） FORCE(TCD078) HEAL (TCD077) Be (TCD076) EVERY （TCD075） FAKE（TCD074） GLAMOUR（TCD073） NOEL（TCD072） MIKADO (TCD071) NUMERO（TCD070） TOKI(TCD069) ROCK(TCD068) ZOOMY（TCD067） DIVA(TCD066) NANO(TCD065) FAMOUS (TCD064) Switch (TCD063) ICONIC(TCD062) ONE (TCD061) AVANT（TCD060） AGENDA (TCD059) RUMBLE(TCD058) BIRTH（TCD057） KADAN (TCD056) ZERO (TCD055) BEAUTY(TCD054) Bloom（TCD053） STYLY (TCD052) VOGUE (TCD051) GENSEN(TCD050) BRIDGE（tcd049） OOPS!（TCD048） ANGEL（TCD047） SKIN（TCD046） SOURCE (TCD045) UNIQUE (TCD044) MAXX (TCD043) MONOLITH (TCD042) STORY (TCD041) Avalon (TCD040) LOTUS (TCD039) VENUS (TCD038) ORION (TCD037) MAG (TCD036) BLOC (TCD035) IZM (TCD034) AGENT (TCD033) VIEW (TCD032) LAW (TCD031) FOCUS (TCD030) SWEETY (TCD029) AMORE (TCD028) CORE (TCD027) Reviewer (TCD026) INNOVATE HACK (TCD025) PHOTEK (TCD024) CUBEY (TCD023) LUXE (TCD022) NEXTAGE (TCD021) Logue (TCD020) Precious (TCD019) Opinion (TCD018) Canvas (TCD017) Chill (TCD016) Grider (TCD015) AN (TCD014) Gorgeous (TCD013) TCD Google Maps Common