Remove two unmaintained vendor packages `i18n` and `paginater`. Changes:
* Rewrite `i18n` package with a more clear fallback mechanism. Fix an unstable `Tr` behavior, add more tests.
* Refactor the legacy `Paginater` to `Paginator`, test cases are kept unchanged.

Trivial enhancement (no breaking for end users):
* Use the first locale in LANGS setting option as the default, add a log to prevent from surprising users.

* 2xx/3xx/4xx/5xx -> http.Status...
* http.StatusFound -> http.StatusTemporaryRedirect
* http.StatusMovedPermanently -> http.StatusPermanentRedirect

* Some refactors related repository model

* Move more methods out of repository

* Move repository into models/repo

* Fix test

* Fix test

* some improvements

* Remove unnecessary function

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

* Move db related basic functions to models/db

* Fix lint

* Fix lint

* Fix test

* Fix lint

* Fix lint

* revert unnecessary change

* Fix test

* Fix wrong replace string

* Use *Context

* Correct committer spelling and fix wrong replaced words

Co-authored-by: zeripath <art27@cantab.net>

* Fix various doc, user-facing, and source comment typos

Found via `codespell -q 3 -S ./options/locale,./vendor -L ba,pullrequest,pullrequests,readby`

* invent ctx.QueryOptionalBool

* [API] ListReleases add draft and pre-release filter

* Add X-Total-Count header

* Add a release to fixtures

* Add TEST for API ListReleases

* fix some ui bug about draft release

- should not show draft release in tag list because
  it will't create real tag
- still show draft release without tag and commit message
  for draft release instead of 404 error
- remove tag load for attachement links because it's useless

Signed-off-by: a101211279 <1012112796@qq.com>

* add test code

* fix test

That's because has added a new release in relaese test database.

* fix dropdown link for draft release

* Add the tag list page to the release page

* Add the tags list view
* Add the delete tag way on ui
* Not delete tag and clear message when delete a release

Signed-off-by: a101211279 <1012112796@qq.com>

* Apply suggestions from code review

Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: zeripath <art27@cantab.net>

* fix ui

* Add to header

* ui

* permission

* ui

* Update options/locale/locale_en-US.ini

Co-authored-by: Lauris BH <lauris@nix.lv>

* tweaks

* monospace commit hashes

* Add read permission check

* fix permission

* fix nit

* Update web_src/less/_base.less

Co-authored-by: silverwind <me@silverwind.io>

* ui fixes

* title tweaks

* fix lint

* fix test

* fix test and some ui nits

* Apply suggestions from code review

Co-authored-by: silverwind <me@silverwind.io>

Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: silverwind <me@silverwind.io>

* Delete tag API

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Wording

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Add conflict response and fix API tests

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix other test

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

* Honor DEFAULT_PAGING_NUM for API

* set pagination to 10 for tests

* lint

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* remove a user from being assigned to any issue/PR if (s)he is removed as a collaborator

* fix gender specific comment

* do not remove users that still have access to the repo if they are a member of a team that can access the repo

* add context to errors

* updates

* incorporate review fixes

* Update models/repo_collaboration.go

Co-Authored-By: 6543 <6543@obermui.de>

* Update models/repo_collaboration.go

Co-Authored-By: 6543 <6543@obermui.de>

* Fix Rebase Relict

* Fix & Impruve

* use xorm builder

* all in one session

* generalize reconsiderIssueAssignees

* Only Unwatch if have no access anymore

* prepare for reuse

* Same things if remove User from Team

* fix lint

* let mysql take time to react

* add description

* CI.restart()

* CI.restart()

Co-authored-by: Lanre Adelowo <yo@lanre.wtf>
Co-authored-by: techknowlogick <matti@mdranta.net>
Co-authored-by: Lauris BH <lauris@nix.lv>

* Change action GETs to POST

* submite = submit + smite

* No more # href

* Fix test

* Match other tests

* Explicit csrf

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>

* tests: add attachements integration

* Update integrations/attachement_test.go

Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>

* Fix data race in testlogger

* Update git_helper_for_declarative_test.go

Signed-off-by: Tamal Saha <tamal@appscode.com>

* fix bug prohibit login not applied on dashboard

* fix tests

* fix bug user status leak

* fix typo

* return after render

* Helper functions for intergration test boilerplate

* Display draft releases

* Include ctx.User in user cache

* Integration test

* improve integration test to resue models/fixtures and store git repos with source

* use gitea-integration-meta dir instead .tar.gz and cleanup every before every test

* fix import package name

* Integration test framework

* udpate drone sign

* Formatting fixes and move router.go to routers/

* update sign for drone