Translations update from Weblate

See merge request !1219

Translations update from Weblate

See merge request !1240

Currently translated at 84.7% (133 of 157 strings)

Translation: AlekSIS/AlekSIS-Core-Frontend
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis-core-frontend/ru/

Currently translated at 100.0% (157 of 157 strings)

Translation: AlekSIS/AlekSIS-Core-Frontend
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis-core-frontend/uk/

Resolve "Urls in confimation email contains the /django/ prefix"

Closes #852

See merge request !1253

Resolve "Improve performance of polling queries"

Closes #847

See merge request !1252

Resolve "Fix whoAmI query" (and make permission query poll)

Closes #860

See merge request !1250

Resolve "Doc for maintainance tasks still mentions yarn install"

Closes #861

See merge request !1251

Merge branch '856-language-select-uses-english-as-default-language-and-not-browser-language' into 'master'

Resolve "Language select uses English as default language (and not browser language)"

Closes #856

See merge request !1245

Merge branch 'master' into '856-language-select-uses-english-as-default-language-and-not-browser-language'

# Conflicts:
#   CHANGELOG.rst

Resolve "Fix metrics URL (/django/)"

Closes #858

See merge request !1246

# Conflicts:
#   CHANGELOG.rst

Resolve "Update material design icons"

Closes #851

See merge request !1242

Resolve "Include dynamic titles in app bar of new SPA"

Closes #859

See merge request !1243

# Conflicts:
#   CHANGELOG.rst
#   aleksis/core/frontend/index.js

Resolve "Include correct Vuetify translations"

Closes #857

See merge request !1244

# Conflicts:
#   CHANGELOG.rst

Resolve "Language select is sometimes not shown due to overlengh in sidenav"

Closes #853

See merge request !1247

# Conflicts:
#   CHANGELOG.rst

Resolve "Search bar in sidenav is sometimes mistakenly shown"

Closes #855

See merge request !1249

# Conflicts:
#   CHANGELOG.rst

# Conflicts:
#   CHANGELOG.rst

Merge branch '854-accept-invitation-menu-item-is-sometimes-shown-even-though-it-is-not-supposed-to' into 'master'

Resolve "Accept invitation menu item is sometimes shown even though it is not supposed to"

Closes #854

See merge request !1248