Refactor project templates (#26448)

This PR refactors a bunch of projects-related code, mostly the
templates.
The following things were done:
  - rename boards to columns in frontend code
  - use the new `ctx.Locale.Tr` method
  - cleanup template, remove useless newlines, classes, comments
  - merge org-/user and repo level project template together
    - move "new column" button into project toolbar
- move issue card (shared by projects and pinned issues) to shared
template, remove useless duplicated styles
- add search function to projects (to make the layout more similar to
milestones list where it is inherited from 😆)
  - maybe more changes I forgot I've done 😆 

Closes #24893

After:
![Bildschirmfoto vom 2023-08-10
23-02-00](cab61456-1d23-4373-8163-e567f1b3b5f9)
![Bildschirmfoto vom 2023-08-10
23-02-26](94b55d60-5572-48eb-8111-538a52d8bcc6)
![Bildschirmfoto vom 2023-08-10
23-02-46](a0358f4b-4e05-4194-a7bc-6e0ecba5a9b6)

---------

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

routers/web/org/projects.go

@@ -47,6 +47,7 @@ func Projects(ctx *context.Context) {
 	sortType := ctx.FormTrim("sort")
 
 	isShowClosed := strings.ToLower(ctx.FormTrim("state")) == "closed"
+	keyword := ctx.FormTrim("q")
 	page := ctx.FormInt("page")
 	if page <= 1 {
 		page = 1
@@ -64,6 +65,7 @@ func Projects(ctx *context.Context) {
 		IsClosed: util.OptionalBoolOf(isShowClosed),
 		OrderBy:  project_model.GetSearchOrderByBySortType(sortType),
 		Type:     projectType,
+		Title:    keyword,
 	})
 	if err != nil {
 		ctx.ServerError("FindProjects", err)
@@ -395,7 +397,7 @@ func ViewProject(ctx *context.Context) {
 	ctx.Data["CanWriteProjects"] = canWriteProjects(ctx)
 	ctx.Data["Project"] = project
 	ctx.Data["IssuesMap"] = issuesMap
-	ctx.Data["Boards"] = boards
+	ctx.Data["Columns"] = boards // TODO: rename boards to columns in backend
 	shared_user.RenderUserHeader(ctx)
 
 	err = shared_user.LoadHeaderCount(ctx)

routers/web/repo/projects.go

@@ -54,6 +54,7 @@ func Projects(ctx *context.Context) {
 	sortType := ctx.FormTrim("sort")
 
 	isShowClosed := strings.ToLower(ctx.FormTrim("state")) == "closed"
+	keyword := ctx.FormTrim("q")
 	repo := ctx.Repo.Repository
 	page := ctx.FormInt("page")
 	if page <= 1 {
@@ -76,6 +77,7 @@ func Projects(ctx *context.Context) {
 		IsClosed: util.OptionalBoolOf(isShowClosed),
 		OrderBy:  project_model.GetSearchOrderByBySortType(sortType),
 		Type:     project_model.TypeRepository,
+		Title:    keyword,
 	})
 	if err != nil {
 		ctx.ServerError("GetProjects", err)
@@ -364,7 +366,7 @@ func ViewProject(ctx *context.Context) {
 	ctx.Data["CanWriteProjects"] = ctx.Repo.Permission.CanWrite(unit.TypeProjects)
 	ctx.Data["Project"] = project
 	ctx.Data["IssuesMap"] = issuesMap
-	ctx.Data["Boards"] = boards
+	ctx.Data["Columns"] = boards // TODO: rename boards to columns in backend
 
 	ctx.HTML(http.StatusOK, tplProjectsView)
 }