UI related edits/fixes

[EttyKitty]

1. Remove the planet tithe income alert. There are tooltips for that now.
2. Fix governor serf execution crash.
3. Edit the spli tooltip.
4. Fix some typos.
5. Fix a unit view crash, related to the use of improper if checks.
6. Fix my typo and SHIFT gives x3 map scroll speed
7. Fix mutation check typo