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

See #3956.

Following is before/after for each page:

## Group title

### Before
![group-title-before](/uploads/d6c013c69f526d553555ff974c29b349/group-title-before.png)

### After
![group-title-after](/uploads/56e0bd176d12943297b5b95d20beb437/group-title-after.png)

---

## Commit title

### Before
![commit-title-before](/uploads/a9bda5212eea843ab4c92acbcf411cdd/commit-title-before.png)

### After
![commit-title-after](/uploads/e3a532460a1e7b0b2a8eb8a6af12abea/commit-title-after.png)

---

## Branch name

### Before
![branch-name-before](/uploads/9d77e39f07cd7b757d02a39f5bc57570/branch-name-before.png)

### After
![branch-name-after](/uploads/6831e9560d196d8a4da209166f224a0f/branch-name-after.png)

---

## Tags name in list

### Before
![tags-name-in-list-before](/uploads/cf0141713af751132fd29220621ea9ab/tags-name-in-list-before.png)

### After
![tags-name-in-list-after](/uploads/902c5b029dc832216ac536d2ad372b83/tags-name-in-list-after.png)

---

## Tag name

### Before
![tags-name-before](/uploads/495acb6b4bab8464a0ffeb8f703435b6/tags-name-before.png)

### After
![tags-name-after](/uploads/f86868dbad57b8226611bcb03e5a9524/tags-name-after.png)

---

## Issue title in list

### Before
![issue-title-in-list-before](/uploads/5f01450aceefdcc2f51984832a4ce6b5/issue-title-in-list-before.png)

### After
![issue-title-in-list-after](/uploads/3144fb231874d23b6b46e108da24b128/issue-title-in-list-after.png)

---

## MR title in list

### Before
![mr-title-in-list-before](/uploads/bd0239104ebf4a5090c724c3851df57c/mr-title-in-list-before.png)

### After
![mr-title-in-list-after](/uploads/16be5460dffc33ff173a6b8ff3250206/mr-title-in-list-after.png)

See merge request !2422