Polish styles in title row for filterable grid

(check w/Anja if unclear)

1. Labels

• they are currently too small
• change to size 12px, color black #2323232
• same style as in default title rows

2. Input fields (eg. search, select box)

• they are currently too strong
• change placeholder text to color grey #888888, light, not italic
• when typing change text to color black #232323, regular

3. Input fields alignment 

• they are currently too low
• adjust so label + input field are visually centre aligned in the row middle

4. Input field placeholder text

• Write "Filter…" (instead of "Type" and "Select")

5. Checkboxes are too big

• change to size 18x18px

6. Drop down menu is too long

• limit height of drop down menu

7. First item in drop down list shouldn't be empty

• change to "All"

Nice to have:

8. Cell borders

• remove border 1px from cells
• add 1px space btw cells
• same as other content rows/cells
• note: this needs to be fixed for all title rows, also the not filterable ones