Rename "base_word" to "lemma".

[simjanos-dev]

In the code lemmas are named "base_word". It should be replaced with "lemma". Also "base_word_reading" with "lemma_reading".

The encountered_words database table also has both "base_word" and "lemma" columns for no reason. Only the lemma should be kept.

[GrimPixel]

You may try VSCodium, which can find and replace all occurrences of some text in a directory.

[simjanos-dev]

I use VSCode, I know about that. I am kind of paranoid, I will still going to look through each change afterwards.