Improve the consistency of commit titles, branch names, tag names, issue/MR titles, on their respective project pages

See #3956 (closed).

Following is before/after for each page:

Group title

Before

After

---

Commit title

Before

After

---

Branch name

Before

After

---

Tags name in list

Before

After

---

Tag name

Before

After

---

Issue title in list

Before

After

---

MR title in list

Before

After