Convert outstanding files to cp1252

[moretrim]

There were many UTF-8 encoded files still, this change converts them to
the cp1252 encoding that the game expects. For a couple files this only
changes some comments, but this also fixes some actual text bugs.

HFM/localisation/0000_minimod.csv is of note because it contained
UTF-8 mojibake that was not valid cp1252. Since the invalid key came
from base game files it was easy to restore it to the original
characters.

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When reviewing this PR, make sure you are looking at the changes with the correct encoding. For instance if using the Github web interface, your browser is likely to pick UTF-8 or fallback to auto-detection (with unpredictable results).

An example of a text bug that this PR fixes:

which was caused by:

HFM/HFM/decisions/FlavourMod_Africa.txt

Lines 1710 to 1712 in 38ca75c

	2084 = { secede_province = THIS change_province_name = "Lüderitzbucht" any_pop = { literacy = -0.99 } life_rating = 21 }
	2086 = { secede_province = THIS change_province_name = "Keetmanshoop" any_pop = { literacy = -0.99 } life_rating = 25 }
	2085 = { secede_province = THIS change_province_name = "Maltahöhe" any_pop = { literacy = -0.99 } life_rating = 25 }