Add helper descriptions on new repo page (#14591)

* Add helper descriptions on new repo page

Add helpers for:
  * repo description
  * .gitignore
  * license
  * README
  * default branch
  * signature trust model

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>

* Oops, rename trust_model_helper

To match similar helper.

trust_model_helper_intro -> trust_model_helper

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>

options/locale/locale_en-US.ini

@@ -665,6 +665,7 @@ email_notifications.disable = Disable Email Notifications
 email_notifications.submit = Set Email Preference
 
 [repo]
+new_repo_helper = A repository contains all project files, including revision history.  Already have it elsewhere? <a href="%s">Migrate repository.</a>
 owner = Owner
 owner_helper = Some organizations may not show up in the dropdown due to a maximum repository count limit.
 repo_name = Repository Name
@@ -687,17 +688,27 @@ use_template = Use this template
 generate_repo = Generate Repository
 generate_from = Generate From
 repo_desc = Description
+repo_desc_helper = Enter short description (optional)
 repo_lang = Language
 repo_gitignore_helper = Select .gitignore templates.
+repo_gitignore_helper_desc = Choose which files not to track from a list of templates for common languages. Typical artifacts generated by each language's build tools are included on .gitignore by default.
 issue_labels = Issue Labels
 issue_labels_helper = Select an issue label set.
 license = License
 license_helper = Select a license file.
+license_helper_desc = A license governs what others can and can't do with your code. Not sure which one is right for your project? See <a target="_blank" rel="noopener noreferrer" href="%s">Choose a license.</a>
 readme = README
 readme_helper = Select a README file template.
+readme_helper_desc = This is the place where you can write a complete description for your project.
 auto_init = Initialize Repository (Adds .gitignore, License and README)
+trust_model_helper = Select trust model for signature verification. Possible options are:
+trust_model_helper_collaborator = Collaborator: Trust signatures by collaborators
+trust_model_helper_committer = Committer: Trust signatures that match committers
+trust_model_helper_collaborator_committer = Collaborator+Committer: Trust signatures by collaborators which match the committer
+trust_model_helper_default = Default: Use the default trust model for this installation
 create_repo = Create Repository
 default_branch = Default Branch
+default_branch_helper = The default branch is the base branch for pull requests and code commits.
 mirror_prune = Prune
 mirror_prune_desc = Remove obsolete remote-tracking references
 mirror_interval = Mirror Interval (valid time units are 'h', 'm', 's'). 0 to disable automatic sync.

templates/repo/create.tmpl

@@ -9,6 +9,9 @@
 				</h3>
 				<div class="ui attached segment">
 					{{template "base/alert" .}}
+
+					<p class="ui center">{{.i18n.Tr "repo.new_repo_helper" "/repo/migrate" | Safe}}</p>
+
 					{{if not .CanCreateRepo}}
 						<div class="ui negative message">
 							<p>{{.i18n.Tr (TrN .i18n.Lang .MaxCreationLimit "repo.form.reach_limit_of_creation_1" "repo.form.reach_limit_of_creation_n") .MaxCreationLimit}}</p>
@@ -59,7 +62,7 @@
 					</div>
 					<div class="inline field {{if .Err_Description}}error{{end}}">
 						<label for="description">{{.i18n.Tr "repo.repo_desc"}}</label>
-						<textarea id="description" name="description">{{.description}}</textarea>
+						<textarea id="description" name="description" placeholder="{{.i18n.Tr "repo.repo_desc_helper"}}">{{.description}}</textarea>
 					</div>
 					<div class="inline field">
 						<label>{{.i18n.Tr "repo.template"}}</label>
@@ -135,6 +138,7 @@
 									{{end}}
 								</div>
 							</div>
+							<span class="help">{{.i18n.Tr "repo.repo_gitignore_helper_desc"}}</span>
 						</div>
 						<div class="inline field">
 							<label>{{.i18n.Tr "repo.license"}}</label>
@@ -148,6 +152,7 @@
 									{{end}}
 								</div>
 							</div>
+							<span class="help">{{.i18n.Tr "repo.license_helper_desc" "https://choosealicense.com/" | Str2html}}</span>
 						</div>
 
 						<div class="inline field">
@@ -161,6 +166,7 @@
 									{{end}}
 								</div>
 							</div>
+							<span class="help">{{.i18n.Tr "repo.readme_helper_desc"}}</span>
 						</div>
 						<div class="inline field">
 							<div class="ui checkbox" id="auto-init">
@@ -171,6 +177,7 @@
 						<div class="inline field">
 							<label for="default_branch">{{.i18n.Tr "repo.default_branch"}}</label>
 							<input id="default_branch" name="default_branch" value="{{.default_branch}}" placeholder="{{.default_branch}}">
+							<span class="help">{{.i18n.Tr "repo.default_branch_helper"}}</span>
 						</div>
 						<div class="inline field">
 							<label>{{.i18n.Tr "repo.settings.trust_model"}}</label>
@@ -185,6 +192,15 @@
 									<div class="item" data-value="collaboratorcommitter">{{.i18n.Tr "repo.settings.trust_model.collaboratorcommitter"}}</div>
 								</div>
 							</div>
+							<div class="help">
+								{{.i18n.Tr "repo.trust_model_helper"}}
+								<ul>
+									<li>{{.i18n.Tr "repo.trust_model_helper_collaborator"}}</li>
+									<li>{{.i18n.Tr "repo.trust_model_helper_committer"}}</li>
+									<li>{{.i18n.Tr "repo.trust_model_helper_collaborator_committer"}}</li>
+									<li>{{.i18n.Tr "repo.trust_model_helper_default"}}</li>
+								</ul>
+							</div>
 						</div>
 						<div class="inline field">
 							<label>{{.i18n.Tr "repo.template"}}</label>