Accept all Latvian Alphabet characters for the Alternative Titles

Unfortunately this is not a simple change.

The problem is that IMDb was begun very early in the internet period, when 8-bit data was fairly new. IMDb was designed to support only the Latin-1 code page, which does not include all the characters required for non Western European languages.

Because the current update system has become very complex, simply switching to a scheme that supports 16-bit code (like UTF-8) was considered too likely to cause problems. Some of the high-level extended ASCII characters were (are) used as control characters, and it is possible that a Unicode character could break the update routines.  Moving to Unicode would require a complete review of the entire software.

As you may know, IMDb is currently rewriting the update system. I assume that they are assuring that it will be able to support Unicode characters. Therefore I doubt that there will be any change to the titles until after that change is complete.