Redmine

I read old report from your forum

#26243

But i have another situation. I don't have emoji plugin to resolve it.
Tell me please, which file with styles is responsible for this ?

My soft:
1) Redmine: 3.4.2
2) MariaDB: 10.1.26
3) Ruby: 2.3.3p222
4) gem list

*** LOCAL GEMS ***

actionmailer (4.2.8, 4.2.7.1, 4.2.5.2)
actionpack (4.2.8, 4.2.7.1, 4.2.5.2)
actionpack-action_caching (1.2.0, 1.1.1)
actionpack-xml_parser (1.0.2)
actionview (4.2.8, 4.2.7.1, 4.2.5.2)
activejob (4.2.8, 4.2.7.1, 4.2.5.2)
activemodel (4.2.8, 4.2.7.1, 4.2.6, 4.2.5.2)
activerecord (4.2.8, 4.2.7.1, 4.2.6, 4.2.5.2)
activesupport (4.2.8, 4.2.7.1, 4.2.6, 4.2.5.2)
addressable (2.5.1, 2.5.0, 2.4.0)
arel (6.0.4, 6.0.3)
bigdecimal (1.2.8)
builder (3.2.3, 3.2.2)
bundler (1.13.6)
coderay (1.1.1)
concurrent-ruby (1.0.5, 1.0.4, 1.0.2, 1.0.1)
css_parser (1.5.0, 1.4.8, 1.3.7)
dalli (2.7.6)
dav4rack (0.3.0)
did_you_mean (1.0.0)
erubis (2.7.0)
globalid (0.4.0, 0.3.7, 0.3.6)
htmlentities (4.3.4, 4.3.1)
httpclient (2.8.3)
i18n (0.7.0)
io-console (0.4.5)
jquery-rails (3.1.4)
json (1.8.6, 1.8.3)
loofah (2.0.3)
mail (2.6.6, 2.6.4)
mime-types (3.1, 3.0)
mime-types-data (3.2016.0521, 3.2016.0221)
mimemagic (0.3.2, 0.3.1)
mini_portile2 (2.1.0, 2.0.0)
minitest (5.10.3, 5.10.1, 5.9.0)
molinillo (0.5.0)
mysql2 (0.4.8, 0.4.4, 0.3.21, 0.3.20)
net-http-persistent (2.9.4)
net-ldap (0.12.1)
net-telnet (0.1.1)
nokogiri (1.7.2, 1.6.8.1, 1.6.7.2)
power_assert (0.2.7)
protected_attributes (1.1.4, 1.1.3)
psych (2.1.0)
public_suffix (2.0.5)
rack (1.6.8, 1.6.5, 1.6.4)
rack-openid (1.4.2)
rack-test (0.6.3)
rails (4.2.8, 4.2.7.1, 4.2.5.2)
rails-deprecated_sanitizer (1.0.3)
rails-dom-testing (1.0.8, 1.0.7)
rails-html-sanitizer (1.0.3)
railties (4.2.8, 4.2.7.1, 4.2.5.2)
rake (12.0.0, 11.1.2, 10.5.0)
rbpdf (1.19.2, 1.19.0)
rbpdf-font (1.19.1, 1.19.0)
rdoc (4.2.1)
redcarpet (3.4.0, 3.3.4)
RedCloth (4.3.2)
redmine_extensions (0.2.4, 0.2.0, 0.1.17, 0.0.29, 0.0.28)
request_store (1.0.5)
roadie (3.2.2, 3.2.1, 3.1.1)
roadie-rails (1.1.1)
ruby-openid (2.3.0)
rubyzip (1.2.1, 1.2.0)
simple_enum (2.3.0)
sprockets (3.7.1, 3.6.0, 3.5.2)
sprockets-rails (3.2.0, 3.0.4)
svg-graph (2.1.0)
test-unit (3.1.7)
thor (0.19.4, 0.19.1)
thread_safe (0.3.6, 0.3.5)
tzinfo (1.2.3, 1.2.2)
uuidtools (2.1.5)
wayback_machine_downloader (1.1.4)
xapian-full-alaveteli (1.2.21.1)
zip-zip (0.3)

Tell me please, how can i fix it ? Thanks for you attention.